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SpaceNetworks
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Tasco 12TE: Using 1.25 eyepieces w/ a .965 focuser
      #6078057 - 09/13/13 12:11 AM Attachment (54 downloads)

I have been using my modified Tasco 12TE 60mm / 700mm focal length refractor with the original diagonal and .965 eyepieces (see the attached photo). Terrestrial and celestial views are good, focus is clear.

In an effort to also use 1.25 eyepieces, I purchased a hybrid .965 to 1.25 ScopeStuff diagonal and some standard plossls. However, I'm not able to bring images into focus. With the focuser tube drawn in as far as possible, images start to take shape but are still blurry (see the second photo).

Am I doing something wrong; have I miscalculated; is there a solution to this?


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SpaceNetworks
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Re: Tasco 12TE: Using 1.25 eyepieces w/ a .965 focuser new [Re: SpaceNetworks]
      #6078060 - 09/13/13 12:12 AM Attachment (26 downloads)

With the focuser tube drawn in as far as possible, images start to take shape but are still blurry:

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terraclarke
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Re: Tasco 12TE: Using 1.25 eyepieces w/ a .965 focuser new [Re: SpaceNetworks]
      #6078433 - 09/13/13 09:45 AM

Haven't done anything wrong really, its just that the optical path for your new configuration of diagonal and 1.25 inch e.p.s is several inches longer that that of the original configuration. You will now need more in-focus than you have given the length of the tube. The alternative is to shorten the tube. This seems to be more of a problem with the smaller Tasco's than with other Japanese 60 and 75mm telescopes. Primarily because of the configuration of their focusers and compound drawtubes.

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SpaceNetworks
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Re: Tasco 12TE: Using 1.25 eyepieces w/ a .965 focuser new [Re: terraclarke]
      #6078808 - 09/13/13 02:00 PM

Quote:

...the optical path for your new configuration of diagonal and 1.25 inch e.p.s is several inches longer that that of the original configuration. You will now need more in-focus than you have given the length of the tube. The alternative is to shorten the tube.



Thanks, Terra. How can more in-focus be achieved? I'd prefer not to shorten the focuser drawtube.


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terraclarke
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Re: Tasco 12TE: Using 1.25 eyepieces w/ a .965 focuser new [Re: SpaceNetworks]
      #6078868 - 09/13/13 02:43 PM

Your options as I see it are

(1) shorten the tube (the main tube).

(2) shorten the focuser drawtube (but then you have to rethread it.

(3) move the objective cell closer to the back, (but again, that is going to require cutting and either re-drilling or re threading the main tube depending on how the cell is attached.

The bottom line is that with your new configuration you have too much distance between the objective and the eyepiece so that the focal plane is falling short of where it needs to be with regard to the eyepiece.

The easiest option is to shorten the main tube from the focuser end. (My original suggestion- i said tube, meaning the main tube, not the draw tube.) Just be very sure your cut is perfectly square and all new drill holes are precisely aligned. (Unless it threads in, in which case you will need to re-thread the tube and that will require a machinist.) But it looked from your pictures that the focuser is attached with set screws so all you need is a drill and a tap.

The only other option is to use a Barlow which will move the focal plane further back from the objective, but it will also increase the power and darken and reduce the field. Not a very good solution. I'd just cut the tube. After all, its a nice little scope but its not an Alvin Clark. You obviously want to use it more than display it or you wouldn't change the optical configuration in the first place.


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fjs
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Re: Tasco 12TE: Using 1.25 eyepieces w/ a .965 focuser new [Re: terraclarke]
      #6078935 - 09/13/13 03:26 PM

If you want to shorten the tube but are hesitant to chop the original, you might be able to get one of these to work. Even if you have to cut one down, at least you can put things back to original if desired.

http://www.cloudynights.com/classifieds/showproduct.php?product=54212&sor...

Edited by fjs (09/13/13 03:28 PM)


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charen
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Re: Tasco 12TE: Using 1.25 eyepieces w/ a .965 focuser new [Re: fjs]
      #6079097 - 09/13/13 05:08 PM

Try a prism diagonal as opposed to a mirror version. They have different light paths and focus travel can be an inch or so different.

Chris


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Jeff Phinney
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Re: Tasco 12TE: Using 1.25 eyepieces w/ a .965 focuser new [Re: terraclarke]
      #6079450 - 09/13/13 09:28 PM

Quote:

Your options as I see it are

(1) shorten the tube (the main tube).

(2) shorten the focuser drawtube (but then you have to rethread it.

(3) move the objective cell closer to the back, (but again, that is going to require cutting and either re-drilling or re threading the main tube depending on how the cell is attached.






(4) Observe objects that are much closer to you whose focus is not at infinity.


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JonH
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Re: Tasco 12TE: Using 1.25 eyepieces w/ a .965 focuser new [Re: Jeff Phinney]
      #6079564 - 09/13/13 10:52 PM

Hi Eric - you could also swap out the objective for one with a longer focal length. Surplus shed do a 60D 800F lens but its not an achromat and there are heaps of 60/900 doublets available (although they will give you the opposite problem). I have seen 60/800 achromat scopes around so you might get lucky and find a lens that fits. I had the same problem using binoviewers with a 4"unitron and eventually got to focus via a Jaegers doublet with a slightly longer focal length.

Good luck - Jon


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SpaceNetworks
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Re: Tasco 12TE: Using 1.25 eyepieces w/ a .965 focuser new [Re: Jeff Phinney]
      #6079595 - 09/13/13 11:12 PM

Thanks for all of your feedback. I can always continue with the original Tasco diagonal, and buy additional 0.965" eyepieces (the only Tasco eyepiece I have that is worthy of continued use is a circle T 20mm.

But I'm also now wondering if it's possible to use 1.25" eyepieces with the 0.965" Tasco diagonal. Are there any sleeves or adapters that make this feasible?


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Datapanic
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Re: Tasco 12TE: Using 1.25 eyepieces w/ a .965 focuser new [Re: SpaceNetworks]
      #6079689 - 09/14/13 12:57 AM

You could try a .965 to 1.25 inch adapter and use a .965 diagonal. No guarantee that it will work, but it does add much less focus travel than a hybrid diagonal. I did it that way, less diagonal, with a Tasco 11TE reflector and had no problems with an 18mm 1.25" ortho.

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bdc52
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Re: Tasco 12TE: Using 1.25 eyepieces w/ a .965 focuser new [Re: Datapanic]
      #6079703 - 09/14/13 01:14 AM

Seconding the prism diagonal. I use one on my 700/60 and all of my eyepieces from 40mm to 6mm reach focus with a bit of room to spare. Could you borrow one from somebody to check it out first?

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SpaceNetworks
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Re: Tasco 12TE: Using 1.25 eyepieces w/ a .965 focuser new [Re: bdc52]
      #6080094 - 09/14/13 10:10 AM

I ordered an Orion 0.965 to 1.25 adapter, and will see what that yields.

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terraclarke
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Re: Tasco 12TE: Using 1.25 eyepieces w/ a .965 focuser new [Re: SpaceNetworks]
      #6080301 - 09/14/13 12:24 PM

The problem with going from 0.965 to 1.25 inch eyepieces in a 0.965 inch diagonal is that it will effectively move the eyepiece back (away from the objective) a distance equal to the height of the eyepiece barrel of the 0.965 inch diagonal. So what you gain in in-focus with the smaller diagonal you loose with the adapter. When I read your original post, I assumed that you were using a prism diagonal (that's all I ever use with any of my vintage long focus refractors) as you only mentioned that it was a hybrid and not a hybrid mirror diagonal. (I used to have a hybrid prism diagonal that was quite nice- Orion used to sell them.) It is true that you will gain in-focus if you switch from a mirror to a prism diagonal of the same physical size, (the gain will be a factor of about 1.5xL) due to the difference of the index of refraction of glass (BK-7 glass has an index of refraction of 1.5168) as compared to the index of reflection of the mirror which is equal to 1, to the ratio of 1- (1/n).

I might add that there are also some very excellent 0.965 inch eyepieces out there in the used market if you search around; you will be able to find Kellners, Plossls, and orthoscopics made by Vixen and Towa without too much trouble. Some of the best eyepieces out there are made by Zeiss and they are 0.965 inch. We have developed a prejudice against them in recent years with the shift over from long focus to short focus telescopes. Yes, they do have a reduced field and shorter eye relief, but if you learn to use them you will be amazed by their performance. Just like it ain't your daddy's Oldsmobile anymore, nor is it his Huygens and Ramsden eyepieces.

Good luck in whatever path you choose.


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SpaceNetworks
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Re: Tasco 12TE: Using 1.25 eyepieces w/ a .965 focuser new [Re: terraclarke]
      #6080585 - 09/14/13 03:17 PM

The photo in my original post shows the position of the focuser drawtube when a distant terrestrial image is in focus, and for lunar/stellar objects it's practically the same. By placing the Orion .965 to 1.25 adapter behind the Tasco .965 diagonal, and using my standard Celestron 1.25 plossls, will focus be achieved?? I'll find out soon. And if that doesn't work…

I see that Agena Astro has a GSO hybrid prism diagonal:
http://agenaastro.com/gso-0-965-1-25-90-hybrid-erect-image-prism-diagonal.html

But if I need to stay with the Tasco .965 diagonal, which cleaned up nicely, like you said, Terra, I can look at acquiring additional .965 eyepieces. Siebert Optics appears to have some nice ones:
http://www.siebertoptics.com/SiebertOptics-.965in-eyepieces.html


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fjs
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Re: Tasco 12TE: Using 1.25 eyepieces w/ a .965 focuser new [Re: SpaceNetworks]
      #6080707 - 09/14/13 04:23 PM

Quote:

I see that Agena Astro has a GSO hybrid prism diagonal:
http://agenaastro.com/gso-0-965-1-25-90-hybrid-erect-image-prism-diagonal.html




Not sure you would want an erect-image diagonal. If you go with the Siebert eyepieces, I would sure like to hear a report. I'm considering them also.


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terraclarke
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Re: Tasco 12TE: Using 1.25 eyepieces w/ a .965 focuser new [Re: fjs]
      #6080831 - 09/14/13 06:03 PM

Yes, as Frank says, don't get an erect image prism diagonal. Amici prisms add additional surfaces of internal reflection and are generally not good for astronomical observations- especially of bright objects where you get spurious reflections or for high magnification- they make the image break down. I think if you use the original 0.965 inch prism, you may be able to achieve focus with your 0.965 to 1.25 adapter, at least for some simpler 1.25 inch eyepieces. Otherwise, your options are:
1) shorten the tube,
2) change out the objective
3) change out the tube
4) stick with better 0.965 inch eyepieces.

I'd be inclined to stick with option 4.

Terra


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SpaceNetworks
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Re: Tasco 12TE: Using 1.25 eyepieces w/ a .965 focuser new [Re: terraclarke]
      #6080926 - 09/14/13 07:05 PM

Just for future reference, does anyone know a source for a hybrid .965 to 1.25 diagonal with a simple 90-degree prism (i.e. NOT an Amici prism)?

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photiost
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Re: Tasco 12TE: Using 1.25 eyepieces w/ a .965 focuser new [Re: charen]
      #6082078 - 09/15/13 01:40 PM

Quote:

Try a prism diagonal as opposed to a mirror version. They have different light paths and focus travel can be an inch or so different.

Chris




Indeed.

Someone at our club had a similar problem and they tried an "older" B&L 1.25"prism diagonal which brought a 12.5mm Ortho and other eyepieces to focus.

I have also noticed that some of the older prism diagonals seem to have a shorter "collar" so the eyepieces sit a bit lower (almost touching the prism) and are thus positioned closer to the objective as well.

I would bring your scope to a local telescope shop and try different diagonals (new + used) you may get lucky.

Let us know how it turns out.
.


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SpaceNetworks
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Re: Tasco 12TE: Using 1.25 eyepieces w/ a .965 focuser new [Re: photiost]
      #6082139 - 09/15/13 02:09 PM

I'm now seeing two possibilities:

1) .965 focuser - Tasco .965 diagonal - .965 to 1.25 adapter - 1.25 ep
2) .965 focuser - .965 to 1.25 adapter - 1.25 prism diagonal - 1.25 ep


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Larry Geary
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Re: Tasco 12TE: Using 1.25 eyepieces w/ a .965 focuser new [Re: SpaceNetworks]
      #6082903 - 09/15/13 10:05 PM

Quote:

I'm now seeing two possibilities:

1) .965 focuser - Tasco .965 diagonal - .965 to 1.25 adapter - 1.25 ep
2) .965 focuser - .965 to 1.25 adapter - 1.25 prism diagonal - 1.25 ep




3) .965 focuser - .965 to 1.25 adapter - 1.25 ep


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pogobbler
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Re: Tasco 12TE: Using 1.25 eyepieces w/ a .965 focuser new [Re: Larry Geary]
      #6083201 - 09/16/13 02:35 AM

I've got a 60mm scope with a .965" focuser. When I got it, I went out and got a .965" to 1.25" adapter and, luckily, my 1.25" eyepieces came to focus with it, but, you know what? I ended up getting some .965" Plossl eyepieces from Hands on Optics and prefer them with the scope. The quality is fine and the size just fits the scope better and doesn't upset the balance of the scope. The eyepieces are around $30 and perform just great. That'd be my recommendation instead of cutting the tube.

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Joe Cepleur
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Re: Tasco 12TE: Using 1.25 eyepieces w/ a .965 focuser new [Re: photiost]
      #6083519 - 09/16/13 09:34 AM

Quote:

...bring your scope to a local telescope shop and try different diagonals (new + used)




It may be easier to find a nearby club, with members who will be eager to help you test their accessories in your scope. Some mail order houses may also have return policies favoring ordering lots of parts, and keeping only those that work.

My rig (albeit with a different brand and model of telescope) is:

Blue Fireball 0.965"-to-1.25" adapter
Celestron 1.25" prism diagonal

Edited by Joe Cepleur (09/16/13 09:35 AM)


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tag1260
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Re: Tasco 12TE: Using 1.25 eyepieces w/ a .965 focuser new [Re: Joe Cepleur]
      #6083604 - 09/16/13 10:26 AM

Also, have you tried other eyepieces? I know I have eyepieces that will work in one but not another when I use adapters.

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SpaceNetworks
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Re: Tasco 12TE: Using 1.25 eyepieces w/ a .965 focuser new [Re: tag1260]
      #6090877 - 09/19/13 11:44 PM Attachment (15 downloads)

I received a .965 to 1.25 adapter, and tried it with my Tasco 60mm:

.965 focuser - Tasco Circle T .965 diagonal - .965 to 1.25 adapter - 1.25 ep
Outcome - unable to reach focus

So I tried Larry's suggestion: .965 focuser - .965 to 1.25 adapter - 1.25 ep
Outcome - reached focus with 3/4" of travel left for the focuser drawtube (see attached blurry photo, taken at twilight)
But I doubt I would be willing to do an impression of Galileo (i.e. straight-through viewing) very often.
Does anyone think a 1.25 prism diagonal could be added to this optical path, and reach focus? I dunno.

Getting additional .965 eyepieces to go with my Tasco Circle T 20mm is starting to look like the best option.


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SpaceNetworks
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Re: Tasco 12TE: Using 1.25 eyepieces w/ a .965 focuser new [Re: SpaceNetworks]
      #6114412 - 10/03/13 12:29 AM Attachment (6 downloads)

Postscript to my search for eyepieces to use with this Tasco 12TE, in addition to the original AH 20mm .965, which reaches focus with around 1.5" of focuser drawtube travel to spare:

I tried an Antares 12.5mm .965 Plossl -- unable to reach focus.
I tried a Celestron 12mm KD .965 Ortho -- unable to reach focus!! (close but no cigar)

Go figure. I am nonplussed.

AH 12.5mm anyone?


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semiosteve
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Re: Tasco 12TE: Using 1.25 eyepieces w/ a .965 focuser new [Re: SpaceNetworks]
      #6114722 - 10/03/13 08:55 AM

I have a Tasco 10TE and can use my Brandons successfully with the Hybrid diagonal. The 10TE has a very long drawtube however, and your mileage may vary...

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Re: Tasco 12TE: Using 1.25 eyepieces w/ a .965 focuser new [Re: semiosteve]
      #6115011 - 10/03/13 11:55 AM

Hi Eric ! I've read your thread with great interest, and as someone mentioned before, it depends on the eyepiece. Have you considered getting a mirror hybrid diagonal I recently tested a TASCO 9S 700mm f/l 60mm,made by Tanzutsu with a hybrid mirror diagonal .The eyepiece used was an 8mm Televue plossl , and I was able to achieve focus with focal room to spare. I noticed that the 8mm fit almost inside the diagonal itself and I got focus.In many ways your instrument is like my 9TE-5 same f/l. I have maybe 3 1/2 inches of focus travel in this scope, so if you can get some 1.25 eyepieces that will allow the optics of those units to be very close to the mirror of the diagonal it should work for you. Any EP that has the optics any different may not work. Gary

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Re: Tasco 12TE: Using 1.25 eyepieces w/ a .965 focuser new [Re: BarabinoSr]
      #6115512 - 10/03/13 03:59 PM

Eric,
How much focuser travel do you have? It seems to me that the best option is to cut about 1-1.5" off the main tube. The loss of that aluminum would be offset by the added weight of the larger stuff inserted. The 'bracing' bar could be dispensed with if you cut into its mounting stud.

Before doing any cutting, remove objective and focuser, strap them to a stick, and experiment to find the 'ideal' separation, hopefully allowing to use all accessories. Then cut the tube to suit. Note that for the purpose of finding focus, critical alignment is not required. Tilt will only introduce astigmatism, not so bad that a reliable focus position cannot be obtained.


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SpaceNetworks
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Re: Tasco 12TE: Using 1.25 eyepieces w/ a .965 focuser new [Re: GlennLeDrew]
      #6116086 - 10/03/13 09:14 PM Attachment (7 downloads)

Quote:

How much focuser travel do you have?




First, let me express how much I appreciate everyone's feedback. I've learned so much by consulting and posting on CN.

Here's the diagnosis: With the focuser tube fully extended, there is 3 7/8" of travel:


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SpaceNetworks
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Re: Tasco 12TE: Using 1.25 eyepieces w/ a .965 focuser new [Re: GlennLeDrew]
      #6116089 - 10/03/13 09:15 PM Attachment (6 downloads)

The Circle T AH 20mm ep reaches focus with 1 7/8" of travel to spare:

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SpaceNetworks
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Re: Tasco 12TE: Using 1.25 eyepieces w/ a .965 focuser new [Re: GlennLeDrew]
      #6116091 - 10/03/13 09:17 PM Attachment (6 downloads)

The Celestron KD 12mm Ortho ep does not reach focus. This was unexpected. It's close, but the focuser tube simply runs out of travel:

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SpaceNetworks
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Re: Tasco 12TE: Using 1.25 eyepieces w/ a .965 focuser new [Re: GlennLeDrew]
      #6116097 - 10/03/13 09:19 PM

The same was true for an Antares 12.5mm .965 Plossl, and for using a hybrid mirror diagonal and 1.25" Plossls.

Prescription???

Perhaps my next gambit should be to look for an AH 12.5mm or H 12.5mm eyepiece.


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BarabinoSr
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Re: Tasco 12TE: Using 1.25 eyepieces w/ a .965 focuser new [Re: SpaceNetworks]
      #6121903 - 10/07/13 08:55 AM Attachment (11 downloads)

Here's a view of the focuser of the 9S. Looks to be very much like the one on your scope, with the 8mm TV plossl in the hybrid diagonal. That worked. Though I have a few nice .965 eyepieces as well as many 1.25" ones, I'll experiment with it over the next few days and see what I come up with .

Edited by BarabinoSr (10/07/13 09:00 AM)


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fjs
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Re: Tasco 12TE: Using 1.25 eyepieces w/ a .965 focuser new [Re: SpaceNetworks]
      #6122179 - 10/07/13 11:14 AM

I'm pretty much a newbie here. This is just not making sense to me. I can't see there being so much of a difference in where the 12mm and 20mm eyepieces reach focus. Do they both have all their elements? I wonder if you had an adapter, what would result by trying them in one of your other scopes.

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SpaceNetworks
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Re: Tasco 12TE: Using 1.25 eyepieces w/ a .965 focuser new [Re: BarabinoSr]
      #6122376 - 10/07/13 12:41 PM

Quote:

I'll experiment with it over the next few days and see what I come up with.




Thanks. I have a H 12.5mm and a Ramsden 9mm on the way and will post results.


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SpaceNetworks
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Re: Tasco 12TE: Using 1.25 eyepieces w/ a .965 focuser new [Re: fjs]
      #6122779 - 10/07/13 03:36 PM

Quote:

I can't see there being so much of a difference in where the 12mm and 20mm eyepieces reach focus. Do they both have all their elements? I wonder if you had an adapter, what would result by trying them in one of your other scopes.




The Celestron .965 orthos and 1.25 plossls, and the Antares .965 plossl-- all reach focus straight through, that is, when I remove the diagonal from the optical path. So the eps are OK. And yes, I may get a 1.25 to .965 adapter to see how the .965 orthos perform in my Orion ED80.


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SpaceNetworks
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Re: Tasco 12TE: Using 1.25 eyepieces w/ a .965 focuser new [Re: SpaceNetworks]
      #6123811 - 10/07/13 11:24 PM

I tried a H 12.5mm and R 9mm, but with the same result-- just a bit short of reaching focus.

The original Circle T Achromatic Huygenian 20mm, which reaches focus with 1 7/8" of travel remaining, has a field lens that sits noticeably closer to the diagonal glass than the other eps I have tried. I would try an AH 12.5mm or lower, but that's about it as far as other eps are concerned.

I could also try again to fix the original focuser, since it would allow the eps to be slightly closer to the objective than the replacement focuser. Optically this has potential as a solution, but mechanical success with the focuser is uncertain.


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Re: Tasco 12TE: Using 1.25 eyepieces w/ a .965 focuser new [Re: SpaceNetworks]
      #6126346 - 10/09/13 04:23 AM

Hi Eric,

Terra did an awesome job of conveying you major issues, along with viable solutions. But, to add to what she and everyone else has suggested, I would try changing the visual back (the screw-on holder at the end of the draw-tube) to a short one. The one that you currently have is about 3/4 of an inch longer than the typical old-school design. If I find one among the collection of spare telescope components I have, I will be more than happy to give it to you in hopes that it will solve your dilemma. Sounds as if you only need a pinch more of in-focus.

Mel


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SpaceNetworks
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Re: Tasco 12TE: Using 1.25 eyepieces w/ a .965 focuser new [Re: dawsonian2000]
      #6127728 - 10/09/13 07:39 PM

Quote:

Hi Eric,

Terra did an awesome job of conveying you major issues, along with viable solutions. But, to add to what she and everyone else has suggested, I would try changing the visual back (the screw-on holder at the end of the draw-tube) to a short one. The one that you currently have is about 3/4 of an inch longer than the typical old-school design. If I find one among the collection of spare telescope components I have, I will be more than happy to give it to you in hopes that it will solve your dilemma. Sounds as if you only need a pinch more of in-focus.

Mel




Hello Mel,

It's true that I only need a little more in-focus. A shorter visual back could be part of a solution. I believe I would also need to cut the barrel of the diagonal shorter.

I haven't removed a visual back from a focuser drawtube before. Do you suppose it is threaded onto the tube, or is it somehow adhered? Obviously I would need to remove the current visual back without risking damage to the drawtube of other parts of the focuser.

Thanks for your help!


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Re: Tasco 12TE: Using 1.25 eyepieces w/ a .965 focuser new [Re: SpaceNetworks]
      #6127816 - 10/09/13 08:23 PM

Should un-screw from the focuser.

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Re: Tasco 12TE: Using 1.25 eyepieces w/ a .965 focuser new [Re: SpaceNetworks]
      #6128305 - 10/10/13 02:01 AM

Hi

tag1260 is correct. They typically unscrew from the focuser. I will continue to look for a shorter one and get to you.

Another option would be to cut the tube off by about an inch. If you are apprehensive about doing this, I would be more than happy to do the work for you for free. All you need to do is get it shipped to me and I would take care of the rest. I am an accomplished ATM, so this would be my way of helping you out and giving back.

Mel


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Re: Tasco 12TE: Using 1.25 eyepieces w/ a .965 focuser new [Re: dawsonian2000]
      #6128703 - 10/10/13 10:07 AM

Mel +2

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Re: Tasco 12TE: Using 1.25 eyepieces w/ a .965 focuser new [Re: terraclarke]
      #6129922 - 10/10/13 09:27 PM

Thanks Terra !

I think we both have offered viable solutions for Eric to consider. I still have to look through my collection spare parts to see if I can find a shorter adapter for him.

BTW - I love the collection of scopes you have. Several of which I have optics for and will be building in the future.

Mel


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Re: Tasco 12TE: Using 1.25 eyepieces w/ a .965 focuser new [Re: dawsonian2000]
      #6129999 - 10/10/13 10:08 PM

A while ago I picked up a Meade 300 that didn't have the focuser back. I bought one like this:

http://www.ebay.com/itm/965-Meade-vintage-refractor-telescope-focuser-back-/3...

and it worked perfectly. With it, I am able to use a Blue Fireball .965 to 1.25 adapter and a true 1.25 diagonal without issue with any of my 1.25 eyepieces.

-Bob


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Re: Tasco 12TE: Using 1.25 eyepieces w/ a .965 focuser new [Re: dawsonian2000]
      #6130096 - 10/10/13 10:51 PM

Thanks Mel. I have enjoyed reading about your ATM projects and looking at the pictures of your fantastic builds that you've posted here on CN. They've been an inspiration for me.

Terra


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Re: Tasco 12TE: Using 1.25 eyepieces w/ a .965 focuser new [Re: dawsonian2000]
      #6130139 - 10/10/13 11:16 PM Attachment (8 downloads)

Thanks to all for your advice and to Mel also for your generous offer!

I estimate that in-focus can be increased by 1/2" to 5/8" by using a shorter visual back and cutting the barrel of the diagonal. This is about the same distance as from the back of the main tube to the collar for the altitude adjusting rod (see attached photo).

Bob, thanks for the heads up about the vintage Meade visual back, which I actually saw and bookmarked last night, then, after seeing your post, I ordered tonight on eBay. Whether it will thread onto the focuser drawtube will be determined.

When I started this project I had no idea I would be scratching for a few extra millimeters!


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Re: Tasco 12TE: Using 1.25 eyepieces w/ a .965 focuser new [Re: SpaceNetworks]
      #6130155 - 10/10/13 11:23 PM

Quote:

Thanks to all for your advice and to Mel also for your generous offer!

I estimate that in-focus can be increased by 1/2" to 5/8" by using a shorter visual back and cutting the barrel of the diagonal. This is about the same distance as from the back of the main tube to the collar for the altitude adjusting rod (see attached photo).

Bob, thanks for the heads up about the vintage Meade visual back, which I actually saw and bookmarked last night, then, after seeing your post, I ordered tonight on eBay. Whether it will thread onto the focuser drawtube will be determined.

When I started this project I had no idea I would be scratching for a few extra millimeters!




I'm assuming your focus tube has internal threads.

Do a search on Google (or Bing) for "tasco 12te" and flip over to images. There are a few pics of the focusers and the backs on them are much shorter than the one you have.

I hope the one from ebay works for you.

-Bob


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Re: Tasco 12TE: Using 1.25 eyepieces w/ a .965 focuser new [Re: terraclarke]
      #6130328 - 10/11/13 02:09 AM

Quote:

Thanks Mel. I have enjoyed reading about your ATM projects and looking at the pictures of your fantastic builds that you've posted here on CN. They've been an inspiration for me.

Terra




Mel,

Started to explore your website, and I too have enjoyed learning about your projects and resources. For starters, I had been looking for an editable observer data file, and yours seems like it will fit my needs. I'll be checking out more of your site soon. Thanks!


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Re: Tasco 12TE: Using 1.25 eyepieces w/ a .965 focuser new [Re: SpaceNetworks]
      #6130411 - 10/11/13 04:30 AM

Eric,

It is so refreshing to see you guys referring to the adapter as a visual back. I wanted to do so earlier, but did not want to confuse our budding amateurs.

Bob,

Awesome that you found the visual back on eBay. I wanted to do some research there, because I know that I saw one out there sometime ago. My colleague Gary Barabino (a.k.a G ) and I were talking about it as early as yesterday.

As I said earlier, I will look in my collection of vintage .965 components before I go on my 1-1/2 day Gulf of Mexico deep sea fishing trip today and see if we can find a visual back for Eric. I will report back before my departure...

Mel


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Re: Tasco 12TE: Using 1.25 eyepieces w/ a .965 focuser new [Re: dawsonian2000]
      #6131747 - 10/11/13 06:46 PM Attachment (8 downloads)

Here's a photo of the focuser drawtube with threads for the visual back. I'm definitely in the market for a shorter visual back to increase in-focus.

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Re: Tasco 12TE: Using 1.25 eyepieces w/ a .965 focuser new [Re: dawsonian2000]
      #6131749 - 10/11/13 06:47 PM Attachment (8 downloads)

One more...

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Re: Tasco 12TE: Using 1.25 eyepieces w/ a .965 focuser new [Re: SpaceNetworks]
      #6132169 - 10/11/13 10:48 PM

Dang, that's not good. The back from ebay will have external threads. You tube has external threads. They won't go together. :-(

-Bob


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Re: Tasco 12TE: Using 1.25 eyepieces w/ a .965 focuser new [Re: ryanr256]
      #6132343 - 10/12/13 01:07 AM Attachment (9 downloads)

Hey Eric ! I see your dilemma. I know if Mel has one he will send it to you, but if he doesn't , let me know. I have one that came from a focuser with a .965 size drawtube with outside threads like yours. Here's a pic. This one is a little bit over 1/2 " thick, with more than 1/4" thread and is not made of dos plastica. G

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Re: Tasco 12TE: Using 1.25 eyepieces w/ a .965 focuser new [Re: BarabinoSr]
      #6132387 - 10/12/13 02:09 AM

Quote:

Hey Eric ! I see your dilemma. I know if Mel has one he will send it to you, but if he doesn't , let me know. I have one that came from a focuser with a .965 size drawtube with outside threads like yours. Here's a pic. This one is a little bit over 1/2 " thick, with more than 1/4" thread and is not made of dos plastica. G




Hello G

That looks very promising indeed-- thanks! Provided the threads match, the specs look spot on.


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Re: Tasco 12TE: Using 1.25 eyepieces w/ a .965 focuser new [Re: SpaceNetworks]
      #6135560 - 10/13/13 06:25 PM

Quote:

Quote:

Hey Eric ! I see your dilemma. I know if Mel has one he will send it to you, but if he doesn't , let me know. I have one that came from a focuser with a .965 size drawtube with outside threads like yours. Here's a pic. This one is a little bit over 1/2 " thick, with more than 1/4" thread and is not made of dos plastica. G




Hello G

That looks very promising indeed-- thanks! Provided the threads match, the specs look spot on.




Hi Eric,

I was hoping to find a visual back before leaving to go on my fishing trip, but I did not have time to check. Nevertheless, upon my returned from the trip, I checked and I found one. I can ship it to you once I have your mailing address, which you can PM me with.

BTW - The fishing trip was awesome!

Thanks Mel


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Re: Tasco 12TE: Using 1.25 eyepieces w/ a .965 focuser new [Re: dawsonian2000]
      #6135731 - 10/13/13 07:59 PM

PM sent.

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Re: Tasco 12TE: Using 1.25 eyepieces w/ a .965 focuser new [Re: SpaceNetworks]
      #6138254 - 10/15/13 02:00 AM Attachment (6 downloads)

Here is a photo of the visual back I will be sending. Basically, it is the same as the one Gary shared a photo of. I hope it moves your eyepiece close enough to achieve sharp focus.

Mel


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Re: Tasco 12TE: Using 1.25 eyepieces w/ a .965 focuser new [Re: terraclarke]
      #6138276 - 10/15/13 02:44 AM

Quote:

Thanks Mel. I have enjoyed reading about your ATM projects and looking at the pictures of your fantastic builds that you've posted here on CN. They've been an inspiration for me.

Terra




I must say, if I am not being too forward, you are the queen, my dear! You inspire us all.

Mel


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Re: Tasco 12TE: Using 1.25 eyepieces w/ a .965 focuser new [Re: dawsonian2000]
      #6138466 - 10/15/13 07:53 AM

Thank you. Wow. I just love our hobby and I love this group.



Terra


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Re: Tasco 12TE: Using 1.25 eyepieces w/ a .965 focuser new [Re: terraclarke]
      #6142223 - 10/17/13 02:14 AM

You are welcome, your highness! ...and I concur with your sentiments.

BTW - The visusl back is on its way across country to a new home. I hope it will resolve Eric's issue by getting the eyepiece closer to the focal plane. I look forward to reading the results.

Mel

Edited by dawsonian2000 (10/17/13 02:15 AM)


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Re: Tasco 12TE: Using 1.25 eyepieces w/ a .965 focuser new [Re: SpaceNetworks]
      #6142232 - 10/17/13 02:36 AM

Quote:

Quote:

Thanks Mel. I have enjoyed reading about your ATM projects and looking at the pictures of your fantastic builds that you've posted here on CN. They've been an inspiration for me.

Terra




Mel,

Started to explore your website, and I too have enjoyed learning about your projects and resources. For starters, I had been looking for an editable observer data file, and yours seems like it will fit my needs. I'll be checking out more of your site soon. Thanks!




Hey Eric,

I failed to thank you for utilizing the observer's data sheet I compiled and posted on my website for download for amateurs looking for a comprehensive form to record their memorable sketched and astrophotographic moments. Thank You so very much! It makes me so happy to see the website serving the purpose I intended it to perform. One of these days, and as my time permits, I will be instilling improvements to make it more current.

Thanks again,

Mel


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Re: Tasco 12TE: Using 1.25 eyepieces w/ a .965 focuser new [Re: dawsonian2000]
      #6142374 - 10/17/13 07:35 AM

I've said it before and I'll say it again, this is the best forum on CN and the best online astronomical community because we have the best, most generous people here in Classics. Classics on CN is a total Class Act!

Terra


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Re: Tasco 12TE: Using 1.25 eyepieces w/ a .965 focuser new [Re: terraclarke]
      #6144153 - 10/18/13 02:11 AM

Quote:

I've said it before and I'll say it again, this is the best forum on CN and the best online astronomical community because we have the best, most generous people here in Classics. Classics on CN is a total Class Act!

Terra




You can say that again!

Mel


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Re: Tasco 12TE: Using 1.25 eyepieces w/ a .965 focuser new [Re: dawsonian2000]
      #6145503 - 10/18/13 07:52 PM Attachment (6 downloads)

Quote:

Here is a photo of the visual back I will be sending. Basically, it is the same as the one Gary shared a photo of. I hope it moves your eyepiece close enough to achieve sharp focus.

Mel




The visual back (VB) that Mel so generously sent has arrived. The focuser drawtube fits inside the VB, but the VB does not thread onto the drawtube. I'm thinking about possible alternative ways to secure the VB. Any suggestions?


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Re: Tasco 12TE: Using 1.25 eyepieces w/ a .965 focuser new [Re: dawsonian2000]
      #6145505 - 10/18/13 07:53 PM Attachment (5 downloads)

Another view:

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Re: Tasco 12TE: Using 1.25 eyepieces w/ a .965 focuser new [Re: dawsonian2000]
      #6145507 - 10/18/13 07:55 PM Attachment (5 downloads)

One more:

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Re: Tasco 12TE: Using 1.25 eyepieces w/ a .965 focuser new [Re: SpaceNetworks]
      #6145893 - 10/19/13 12:20 AM

My old try and true method to take up the slack between the draw tube and vb would be to add a small piece of paper, perhaps a little strip, between the male and female threads of the draw tube and vb. Use trial and error on the strip size but it should be fair size. Works every time. Just remember to cut off any of the exposed paper,and don't use too big a piece that may obstruct the light path. G

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Re: Tasco 12TE: Using 1.25 eyepieces w/ a .965 focuser new [Re: SpaceNetworks]
      #6145975 - 10/19/13 01:23 AM

Eric,

I would go with the aluminum tape you suggested in the PM. One layer should prove sufficient. If it is too much, then use small strips spaced evenly around the threads.

Mel


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Re: Tasco 12TE: Using 1.25 eyepieces w/ a .965 focuser new [Re: dawsonian2000]
      #6148608 - 10/20/13 03:37 PM Attachment (3 downloads)

I was able to secure the visual back to the focuser drawtube. I used a thin strip of Scotch foam mounting tape over the bottom one-third of the VB threads. This decreased the inside diameter of the VB while also providing an adhesive on both sides. Foam mounting tape is compressible, and removable in case I needed to back out of this solution.

The VB then fit snugly over the drawtube, with the adhesive of the foam tape along the bottom one-third. Next, I cut a thin strip of aluminum foil tape to join the top of the VB to the top of the drawtube. The VB seems reasonably secure and the drawtube retracts as far as possible.


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Re: Tasco 12TE: Using 1.25 eyepieces w/ a .965 focuser new [Re: dawsonian2000]
      #6148611 - 10/20/13 03:40 PM Attachment (4 downloads)

Now I just need to find a machinist to cut 16mm (.63 in.) off the barrel of the prism diagonal. And if focus isn't reached after all that, I guess I'll move to Alaska, and you'll never hear from me again!

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Re: Tasco 12TE: Using 1.25 eyepieces w/ a .965 focuser new [Re: SpaceNetworks]
      #6148681 - 10/20/13 04:35 PM

Quote:

And if focus isn't reached after all that, I guess I'll move to Alaska, and you'll never hear from me again!




No don't! That's extreme. You can move to Alaska, change your e-mail address, then change your ID, and continue to post here!


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Re: Tasco 12TE: Using 1.25 eyepieces w/ a .965 focuser new [Re: fjs]
      #6148716 - 10/20/13 04:54 PM

Maybe I missed something earlier, but why are there are two different labels on the focuser, each with the same basic information, but one says China, the other Japan??? I've never seen such a thing?

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Re: Tasco 12TE: Using 1.25 eyepieces w/ a .965 focuser new [Re: terraclarke]
      #6148743 - 10/20/13 05:28 PM

The replacement focuser is new, from China. I added the badge from the original to ID the rest of the scope for what it is, ca. 1959 Circle T from Japan.

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Re: Tasco 12TE: Using 1.25 eyepieces w/ a .965 focuser new [Re: SpaceNetworks]
      #6148903 - 10/20/13 06:55 PM

Ah ha! That explains it.

Good job Eric,

Terra


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Re: Tasco 12TE: Using 1.25 eyepieces w/ a .965 focuser new [Re: SpaceNetworks]
      #6152266 - 10/22/13 07:09 PM Attachment (4 downloads)

If you send it to me I can modify it for you on my South bend. It should have threads on one end so you can unscrew it and send just the barrel. Send me a personal message if you want.
Mike


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Re: Tasco 12TE: Using 1.25 eyepieces w/ a .965 focuser new [Re: Mike W]
      #6154706 - 10/24/13 01:08 AM

Quote:

If you send it to me I can modify it for you on my South bend. It should have threads on one end so you can unscrew it and send just the barrel. Send me a personal message if you want.
Mike




PM sent.


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Re: Tasco 12TE: Using 1.25 eyepieces w/ a .965 focuser new [Re: Mike W]
      #6158169 - 10/25/13 08:49 PM



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Re: Tasco 12TE: Using 1.25 eyepieces w/ a .965 focuser new [Re: Mike W]
      #6158174 - 10/25/13 08:52 PM



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Re: Tasco 12TE: Using 1.25 eyepieces w/ a .965 focuser new [Re: Mike W]
      #6158179 - 10/25/13 08:54 PM Attachment (3 downloads)

More recent parts on the lathe

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Re: Tasco 12TE: Using 1.25 eyepieces w/ a .965 focuser new [Re: Mike W]
      #6158264 - 10/25/13 09:48 PM

Looks like you do nice work! You could certainly fill the void left when another individual who did this kind of work retired( ).

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Re: Tasco 12TE: Using 1.25 eyepieces w/ a .965 focuser new [Re: greju]
      #6158544 - 10/26/13 01:29 AM

Off topic....how do you like your lathe?

Your work looks fine and I have plans to purchase a lathe expressly for projects such as this.


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Re: Tasco 12TE: Using 1.25 eyepieces w/ a .965 focuser new [Re: Mike W]
      #6159147 - 10/26/13 01:00 PM

Mike, nice lathe, beautiful work.

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Re: Tasco 12TE: Using 1.25 eyepieces w/ a .965 focuser new [Re: Mike W]
      #6163227 - 10/28/13 07:39 PM

Quote:

More recent parts on the lathe




Hey Mike!

I agree with everyone else! Very nice work! And I love the South Bend lathe and chest! I wish I had one. There is so much I would love to do with one of these babies.

BTW - Kudos to you for extending a helping hand to Eric. I am sure he knows he has a lot of great friends here on CN.

Mel


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Re: Tasco 12TE: Using 1.25 eyepieces w/ a .965 focuser new [Re: Mike W]
      #6163288 - 10/28/13 08:32 PM

A package with the prism diagonal is on its way to Mike.

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Re: Tasco 12TE: Using 1.25 eyepieces w/ a .965 focuser new [Re: SpaceNetworks]
      #6163355 - 10/28/13 09:05 PM

Hey! I see a sliver of aluminum tape took care of attaching the visual back. Once Mike machines the diagonal, I look forward to your report on the performance of your scope.

Good Luck,
Mel


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Re: Tasco 12TE: Using 1.25 eyepieces w/ a .965 focuser new [Re: SpaceNetworks]
      #6172341 - 11/02/13 05:47 PM Attachment (7 downloads)

Quote:

A package with the prism diagonal is on its way to Mike.




Sorry to be away but my busy time at work and am doing a review on the SB1001 lathe on two machinists sites. Thanks to all for the compliments! I really do like this lathe. I went down to Muncy Pa. and picked it up on my vacation. Good trip and my brother came along for the ride. Would have liked to use the new lathe for the diagonal project but since the tubes are not removable from the diagonal I had to sweat it out on the band saw. Since the diagonal has a flat side I didn't need to make a jig, just free hand. No cracks in the glass and some time filing and reaming and it's done! All's left is to repack and send it out.

Edited by Mike W (11/02/13 07:21 PM)


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Re: Tasco 12TE: Using 1.25 eyepieces w/ a .965 focuser new [Re: Mike W]
      #6172348 - 11/02/13 05:52 PM Attachment (7 downloads)

Another finished photo.
Hope it works for you Eric!


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Re: Tasco 12TE: Using 1.25 eyepieces w/ a .965 focuser new [Re: dawsonian2000]
      #6172467 - 11/02/13 07:28 PM

Quote:

Quote:

More recent parts on the lathe




Hey Mike!

I agree with everyone else! Very nice work! And I love the South Bend lathe and chest! I wish I had one. There is so much I would love to do with one of these babies.

BTW - Kudos to you for extending a helping hand to Eric. I am sure he knows he has a lot of great friends here on CN.

Mel



Hey Mel,
Didn't I just ship you a Byers gear set for
your friend in Denmark?
Mike


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Re: Tasco 12TE: Using 1.25 eyepieces w/ a .965 focuser new [Re: Mike W]
      #6172594 - 11/02/13 08:55 PM

Quote:

Another finished photo.
Hope it works for you Eric!




Hi Mike,

Looks like precision work-- thank you!! I look forward to testing it out, and am keeping my fingers crossed about reaching focus.


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Re: Tasco 12TE: Using 1.25 eyepieces w/ a .965 focuser new [Re: SpaceNetworks]
      #6172661 - 11/02/13 09:47 PM Attachment (4 downloads)

Just waiting for the postman! Wasn't that a song?

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Re: Tasco 12TE: Using 1.25 eyepieces w/ a .965 focuser new [Re: Mike W]
      #6176201 - 11/04/13 08:09 PM

Sorry about the corny joke. Diagonal is on the way back to Eric so hopefully he'll give us some good news and it reaches focus!

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Re: Tasco 12TE: Using 1.25 eyepieces w/ a .965 focuser new [Re: Mike W]
      #6176354 - 11/04/13 09:38 PM

Hi Mike,

I see that the postman has the package-- thanks for the quick turnaround! I'll continue to track it online till it arrives at my door, and will post results very soon.


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Re: Tasco 12TE: Using 1.25 eyepieces w/ a .965 focuser new [Re: SpaceNetworks]
      #6176509 - 11/04/13 10:55 PM

I look forward to reading great results once you receive the diagonal back from Mike.

Mel


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Re: Tasco 12TE: Using 1.25 eyepieces w/ a .965 focuser new [Re: Mike W]
      #6176521 - 11/04/13 11:04 PM

Quote:

Quote:

Quote:

More recent parts on the lathe




Hey Mike!

I agree with everyone else! Very nice work! And I love the South Bend lathe and chest! I wish I had one. There is so much I would love to do with one of these babies.

BTW - Kudos to you for extending a helping hand to Eric. I am sure he knows he has a lot of great friends here on CN.

Mel



Hey Mel,
Didn't I just ship you a Byers gear set for
your friend in Denmark?
Mike




Hi Mike,

Yes, I believe you did! His name is Eric Moreman of Belgium. Since then, I have purchased a couple drives from Mr. Byers himself, to build my own custom EQ head.

Mel


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Re: Tasco 12TE: Using 1.25 eyepieces w/ a .965 focuser new [Re: dawsonian2000]
      #6179920 - 11/06/13 08:09 PM

Small world!
All the best,
Mike


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Re: Tasco 12TE: Using 1.25 eyepieces w/ a .965 focuser new [Re: Mike W]
      #6180052 - 11/06/13 09:43 PM

Quote:

Small world!
All the best,
Mike




Yes, it can be!

Mel


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Re: Tasco 12TE: Using 1.25 eyepieces w/ a .965 focuser new [Re: dawsonian2000]
      #6182080 - 11/08/13 12:08 AM Attachment (3 downloads)

Quote:

I look forward to reading great results once you receive the diagonal back from Mike.

Mel




The prism diagonal, less 16mm (.63 in.) of the barrel, has arrived from Mike, and is in great shape! I've done some initial testing. For terrestrial viewing, it's been a complete success; for celestial viewing, a partial success.

The original AH 20mm Circle T ep has always reached focus with plenty of focuser travel remaining. The challenge has been finding additional eps that reach focus. Here are the eps I've tested and the results:

Ortho 12mm, Celestron: Terrestrial focus reached w/ 10mm travel remaining ; lunar focus reached w/ 2mm travel remaining
Ortho 6mm, Celestron: Terrestrial focus reached w/ 5mm travel remaining ; lunar focus not reached
H 12.5, Meade (Japan): Terrestrial focus reached w/ 6mm travel remaining ; lunar focus not reached

The diagonal modification-- I would characterize it as a success. Overall, this is a meaningful improvement.

Thanks to all, including Stephen, Terra, Mel, G , and Mike-- you're all the best!

Photo: Ortho 12mm, Celestron: Terrestrial focus reached w/ 10mm travel remaining


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Re: Tasco 12TE: Using 1.25 eyepieces w/ a .965 focuser new [Re: dawsonian2000]
      #6182090 - 11/08/13 12:14 AM Attachment (3 downloads)

This Ortho 12mm Celestron ep also reaches focus viewing the Moon w/ 2mm travel remaining.

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Re: Tasco 12TE: Using 1.25 eyepieces w/ a .965 focuser new [Re: SpaceNetworks]
      #6184013 - 11/09/13 02:40 AM

Quote:

Quote:

I look forward to reading great results once you receive the diagonal back from Mike.

Mel




The prism diagonal, less 16mm (.63 in.) of the barrel, has arrived from Mike, and is in great shape! I've done some initial testing. For terrestrial viewing, it's been a complete success; for celestial viewing, a partial success.

The original AH 20mm Circle T ep has always reached focus with plenty of focuser travel remaining. The challenge has been finding additional eps that reach focus. Here are the eps I've tested and the results:

Ortho 12mm, Celestron: Terrestrial focus reached w/ 10mm travel remaining ; lunar focus reached w/ 2mm travel remaining
Ortho 6mm, Celestron: Terrestrial focus reached w/ 5mm travel remaining ; lunar focus not reached
H 12.5, Meade (Japan): Terrestrial focus reached w/ 6mm travel remaining ; lunar focus not reached

The diagonal modification-- I would characterize it as a success. Overall, this is a meaningful improvement.

Thanks to all, including Stephen, Terra, Mel, G , and Mike-- you're all the best!

Photo: Ortho 12mm, Celestron: Terrestrial focus reached w/ 10mm travel remaining




You are most welcome, Eric! If there is anything else I can be of help to you regarding your project(s), please let me know.

Mel


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Re: Tasco 12TE: Using 1.25 eyepieces w/ a .965 focuser new [Re: SpaceNetworks]
      #6184228 - 11/09/13 08:51 AM

Quote:

This Ortho 12mm Celestron ep also reaches focus viewing the Moon w/ 2mm travel remaining.




Hi Eric,
How far from the prism do your eyepiece barrels reach? Can the other end of the diagonal be cut?
Mike


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Re: Tasco 12TE: Using 1.25 eyepieces w/ a .965 focuser new [Re: Mike W]
      #6184456 - 11/09/13 11:05 AM

Quote:

How far from the prism do your eyepiece barrels reach? Can the other end of the diagonal be cut?
Mike




Mike,

I would have to say that, because of the length of the barrel of the AH 20mm ep, the other end of the diagonal should not be cut.

A bit of additional good news: I have a Ramsden 9mm that just does reach focus on the Moon. So with 20mm, 12mm, and 9mm eps, the magnification range for celestial viewing is now x35 to x78.


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Re: Tasco 12TE: Using 1.25 eyepieces w/ a .965 focuser new [Re: SpaceNetworks]
      #6187299 - 11/10/13 06:31 PM Attachment (4 downloads)

Quote:

Quote:

How far from the prism do your eyepiece barrels reach? Can the other end of the diagonal be cut?
Mike




Mike,

I would have to say that, because of the length of the barrel of the AH 20mm ep, the other end of the diagonal should not be cut.

A bit of additional good news: I have a Ramsden 9mm that just does reach focus on the Moon. So with 20mm, 12mm, and 9mm eps, the magnification range for celestial viewing is now x35 to x78.




Glad to hear your making progress and have a functioning selection of magnifications! Anymore I can do let me know.

Been doing some test cuts on the new lathe and finished the reviews for the most part. Threads take a life of their own and you never know where they end up. Final cut of .060" DOC or .120" off the diameter of steel bar in one pass! High range at 604 rpm's(200 rpm's above idle, lathes top speed 2300 rpm's) with carbide insert. Good for a lathe of this size.
BTW the steel bar is "between centers" to keep it from flexing


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Re: Tasco 12TE: Using 1.25 eyepieces w/ a .965 focuser new [Re: Mike W]
      #6187311 - 11/10/13 06:38 PM Attachment (5 downloads)

Second photo is facing and turning a piece of brass stock, face was perfectly flat and good finish. BTW about 700 rpm's with carbide insert, could have gone faster.

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Re: Tasco 12TE: Using 1.25 eyepieces w/ a .965 focuser new [Re: Mike W]
      #6188983 - 11/11/13 04:34 PM

Mike,

I don't know anything about lathes, but your South Bend looks like one lean machine!

Yesterday I purchased a Celestron 9mm ortho .965 ep, and a Meade .965 2X Barlow, which should arrive later this week. I'll test out how they work with my Tasco.

And I'm putting an envelope in the post for you later this week, too.

Cheers,


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Re: Tasco 12TE: Using 1.25 eyepieces w/ a .965 focuser new [Re: SpaceNetworks]
      #6189530 - 11/11/13 09:44 PM

I'll look forward to that! Good luck with the eyepieces.
Mike


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Re: Tasco 12TE: Using 1.25 eyepieces w/ a .965 focuser new [Re: SpaceNetworks]
      #6191385 - 11/12/13 07:05 PM

Quote:

Mike,

I don't know anything about lathes, but your South Bend looks like one lean machine!

Yesterday I purchased a Celestron 9mm ortho .965 ep, and a Meade .965 2X Barlow, which should arrive later this week. I'll test out how they work with my Tasco.

And I'm putting an envelope in the post for you later this week, too.

Cheers,




Thanks about the lathe! Now it's just a question of can I live up to it's potential. I am finding it very hard to do my regular job anymore, and would love to make parts etc. as a supplemental income. Thirty years of fixing HVAC and stand by generators in all kinds of weather have taken a toll, not to mention N/H lymphoma. This years surprise is worsening arthritis in my fingers that makes it tough to manipulate tiny screws etc. Don't get me wrong I'm very happy and Astronomy and my machine shop keep me busy. Camping with my Aliner also and I always take a telescope, Stellafane and Ct. Star Party were this years trips. Would like to try Black Forest next year.

Sorry for dragging the thread off topic!
Your Tasco has a special feeling for me. My first telescop was a Jason of lesser quality (no diagonal, you pulled the drawtube in and out to change mag.) but special just the same. I mapped the moon with that little Jason for a science fair. Didn't get any prize but learned when using pencil not to lay your hand on the poster board! A little smugey but you could still tell it was the moon and all the Seas were basically in the right place! It didn't help a girl with a Unitron was doing variable star work!
Mike

Edited by Mike W (11/12/13 07:08 PM)


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Re: Tasco 12TE: Using 1.25 eyepieces w/ a .965 focuser new [Re: SpaceNetworks]
      #6191404 - 11/12/13 07:20 PM

Quote:

Mike,

I don't know anything about lathes, but your South Bend looks like one lean machine!

Yesterday I purchased a Celestron 9mm ortho .965 ep, and a Meade .965 2X Barlow, which should arrive later this week. I'll test out how they work with my Tasco.

And I'm putting an envelope in the post for you later this week, too.

Cheers,




That should prove to be a great ocular for your scope; as long as it reaches focus, which I believe it will. Old G loves the faithful 9mm ortho.

Mel


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Re: Tasco 12TE: Using 1.25 eyepieces w/ a .965 focuser new [Re: Mike W]
      #6191438 - 11/12/13 07:36 PM

Quote:

Quote:

Mike,

I don't know anything about lathes, but your South Bend looks like one lean machine!

Yesterday I purchased a Celestron 9mm ortho .965 ep, and a Meade .965 2X Barlow, which should arrive later this week. I'll test out how they work with my Tasco.

And I'm putting an envelope in the post for you later this week, too.

Cheers,




Thanks about the lathe! Now it's just a question of can I live up to it's potential. I am finding it very hard to do my regular job anymore, and would love to make parts etc. as a supplemental income. Thirty years of fixing HVAC and stand by generators in all kinds of weather have taken a toll, not to mention N/H lymphoma. This years surprise is worsening arthritis in my fingers that makes it tough to manipulate tiny screws etc. Don't get me wrong I'm very happy and Astronomy and my machine shop keep me busy. Camping with my Aliner also and I always take a telescope, Stellafane and Ct. Star Party were this years trips. Would like to try Black Forest next year.

Sorry for dragging the thread off topic!
Your Tasco has a special feeling for me. My first telescop was a Jason of lesser quality (no diagonal, you pulled the drawtube in and out to change mag.) but special just the same. I mapped the moon with that little Jason for a science fair. Didn't get any prize but learned when using pencil not to lay your hand on the poster board! A little smugey but you could still tell it was the moon and all the Seas were basically in the right place! It didn't help a girl with a Unitron was doing variable star work!
Mike




Hey Mike,

Sorry to hear about your health issues. I do understand. But from what I can see, you are not letting it get in the way. I am very happy to see you hanging tough. Truly inspiring, to say the least.

...and yes, you do great work on your lathe. I think you should do it for extra income. I wish I had the time to put into something like this myself.

Mel


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Re: Tasco 12TE: Using 1.25 eyepieces w/ a .965 focuser new [Re: Mike W]
      #6191589 - 11/12/13 08:57 PM

Quote:


Sorry for dragging the thread off topic!

Mike




Are you kidding me? I think it's great, have a field day! In a few days, I'll post results for the 9mm ortho. Mel seems optimistic, but it's going to be close and could go either way.

And I'll risk going off topic by stating that once I've pushed the optics of this scope to my satisfaction, I'm going to store the OTA while I refinish the wood tripod and ep tray, something I'm looking forward to.


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Re: Tasco 12TE: Using 1.25 eyepieces w/ a .965 focuser new [Re: dawsonian2000]
      #6191670 - 11/12/13 09:38 PM

Thank you for the kind words Mel. Keep making nice scopes down there!
Mike


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Re: Tasco 12TE: Using 1.25 eyepieces w/ a .965 focuser new [Re: SpaceNetworks]
      #6191681 - 11/12/13 09:44 PM

Thanks again Eric! Will look forward to seeing the refinishing, It's great to restore classic scopes! Now that my old lathe has gone to a new home there's an empty room in the house with two work tables,HMMM

Edited by Mike W (11/13/13 07:42 PM)


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Re: Tasco 12TE: Using 1.25 eyepieces w/ a .965 focuser new [Re: Mike W]
      #6195797 - 11/15/13 12:27 AM Attachment (5 downloads)

The .965 Celestron 9mm ortho arrived and… Mel was right! Much to my delight, it reached focus with 2mm of travel to spare while viewing the Moon. So eps for this Tasco 12TE for celestial viewing are now rounded out with:

Circle T AH 20mm (original with the scope)
Celestron 12mm KD ortho
Celestron 9mm ortho

Here they are, arrayed in full Cambridge Star Atlas glory:

Edited by SpaceNetworks (11/15/13 12:30 AM)


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Re: Tasco 12TE: Using 1.25 eyepieces w/ a .965 focuser new [Re: SpaceNetworks]
      #6210628 - 11/23/13 02:24 AM

Awesome! Sometimes I can even surprise myself!

From what I can see, you now have a nice rounded low, medium and high power collection of oculars to observe with. Now go out there and put your instrument to use. I recommend recording some memorable observations with it. I have an observer's data sheet you can download from the homepage of my website. Or, make your own. Believe me, you will not regret looking back at those precious observing sessions way into the future.

Mel


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