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What did you do to your Scope/Mount Today?

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#4026 DMala

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Posted 04 January 2019 - 09:44 PM

Making some progress with the Edmund 8" No. 4005 (a.k.a. as monster focuser bearer).

I am working on the issue of the OTA hole for the focuser, which the previous owner enlarged to install an aftermarket Crayford focuser (Pic 1).

 

First I made  a cardboard template with a smaller hole (2.6"), which I guess is more proportionate to the 2" focuser tube (Pic 2). I positioned it using the original guiding focuser holes as reference. Then I installed the guiding focuser and verified that the hole is centered. It is (Pic 3-4). Note in pic 4 the prism that gathers the image for the 1.25" guiding focuser.

 

Next I traced the template onto a piece of black neoprene sheet from an art supply store, and glued over it a black fabric sheet also from the same source (pic 5). I re-cut the hole for the 2" main focuser tube. This flocked neoprene sheet was installed over the enlarged focuser hole, flocked side towards the inside, and will be retained by the focuser base itself, and probably a dab of contact cement.

 

I ran however into a problem at that point. I realized that the retaining screws of the focuser base plate where pulling in and deforming the OTA (pic 6).

 

The solution that I came up with is to use a 10-32 nut and a washer as spacers between the OTA and the focuser, to support the former (pic 7). 

 

Next I will have to clean the mirrors that, from what I can see so far, seem still in very decent condition. I thought at the possibility to have them recoated since I have Majestic only 20 min away, but to be honest I do not feel like dealing with the complication of re-assembly and collimating the secondary, which has a rather complex system of adjusting bolts and screws. 

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Edited by DMala, 04 January 2019 - 09:46 PM.

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#4027 DMala

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Posted 06 January 2019 - 10:10 AM

Primary mirror cleanup day yesterday. After dusting it off with an air compressor,  I rinsed it with water and dish soap detergent/cotton swab. Next I rinsed it with distilled water and dried it with more compressed air. After that there was still some trace of haze, and even if a bit concerned about over-cleaning, I decided to make a pass first with Zeiss lens cleaner (good detergent, but leaving a film of I guess silicone or some other waxy product) and last with an alcohol/water plate glass cleaner (by Xerox). Satisfied and relieved that the results seemed good, I started the work on the paper template for marking the mirror center.

Yesterday I also refreshed the black paint of the inside of the secondary mirror and vane holder ring, using a black shoe edge dressing product (which I used many times in the past to revive black wrinkle paint).

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#4028 clamchip

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Posted 06 January 2019 - 06:05 PM

The Optical Craftsmen 8 inch with some close up shots.

I moved the telescope over to my Unistar for some Grab-N-Go winter observing.

The mirror cell you can see has extra long springs because the original mirror was f6.3 the new mirror is f/6

I wish I had the original but its actually 3 mirrors  gone, Parks now, when I bought the scope it had a Coulter

f/6 but the coatings are all gone. The Parks is fabulous. And I replaced the diagonal (coating gone) with a 

new old Novak 1.75" quartz.

Here's the super focuser all tuned up and super smooth.

This telescope is lightweight and well built and extremely sharp.

Robert

 

post-50896-14073262413802_thumb.jpg

IMG_8975.jpg

IMG_8966.jpg

IMG_8964.jpg


Edited by clamchip, 06 January 2019 - 06:07 PM.

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#4029 clamchip

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Posted 06 January 2019 - 06:06 PM

IMG_8970.jpg

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IMG_8971.jpg


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#4030 Augustus

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Posted 06 January 2019 - 08:10 PM

Earlier today I installed a 0.5" spacer on my RV6's focuser so I could reach focus with all of my eyepieces, and replaced the collimation nuts with knurled knobs.


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#4031 Michael Covington

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Posted 06 January 2019 - 10:08 PM

RV-6 trivia question.  Do surviving RV-6's still have their characteristic smell?  I would imagine that they don't, unless maybe the tube has been cut recently.  But for me in 1971 that was the smell of astronomy.


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#4032 Augustus

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Posted 06 January 2019 - 10:19 PM

RV-6 trivia question.  Do surviving RV-6's still have their characteristic smell?  I would imagine that they don't, unless maybe the tube has been cut recently.  But for me in 1971 that was the smell of astronomy.

You mean the Bakelite tube smell?

 

Yup.


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#4033 CCD-Freak

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Posted 06 January 2019 - 11:35 PM

The Optical Craftsmen 8 inch with some close up shots.

I moved the telescope over to my Unistar for some Grab-N-Go winter observing.

The mirror cell you can see has extra long springs because the original mirror was f6.3 the new mirror is f/6

I wish I had the original but its actually 3 mirrors  gone, Parks now, when I bought the scope it had a Coulter

f/6 but the coatings are all gone. The Parks is fabulous. And I replaced the diagonal (coating gone) with a 

new old Novak 1.75" quartz.

Here's the super focuser all tuned up and super smooth.

This telescope is lightweight and well built and extremely sharp.

Robert

 

attachicon.gif post-50896-14073262413802_thumb.jpg

attachicon.gif IMG_8975.jpg

attachicon.gif IMG_8966.jpg

attachicon.gif IMG_8964.jpg

I found some pictures of the 10" Optical Craftsman Newtonian at the Cooke County College in Gainesville, Texas circa 1972.  Interesting to see how it compares to yours.

 

OC-10-Phil-sm.jpg

OC-10-Rod-Phil-Dr Stewart-sm.jpg

 

Somewhere I have a picture of the mount but I have not found it yet.

 

John Love

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WD5IKX


Edited by CCD-Freak, 06 January 2019 - 11:36 PM.

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#4034 Michael Covington

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Posted 07 January 2019 - 09:33 AM

You mean the Bakelite tube smell?

 

Yup.

Interesting.  One more reason to wish for another RV-6 eventually...



#4035 clamchip

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Posted 07 January 2019 - 11:58 AM

I found some pictures of the 10" Optical Craftsman Newtonian at the Cooke County College in Gainesville, Texas circa 1972.  Interesting to see how it compares to yours.

 

attachicon.gif OC-10-Phil-sm.jpg

attachicon.gif OC-10-Rod-Phil-Dr Stewart-sm.jpg

 

Somewhere I have a picture of the mount but I have not found it yet.

 

John Love

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It is interesting and the only other one I've seen with the finder on the right side of the focuser.

 

Robert


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#4036 mikerepp

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Posted 09 January 2019 - 08:43 AM

post-37830-0-31334900-1546835646_thumb.jpg


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#4037 tim53

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Posted 09 January 2019 - 11:30 AM

I found some pictures of the 10" Optical Craftsman Newtonian at the Cooke County College in Gainesville, Texas circa 1972.  Interesting to see how it compares to yours.

 

attachicon.gif OC-10-Phil-sm.jpg

attachicon.gif OC-10-Rod-Phil-Dr Stewart-sm.jpg

 

Somewhere I have a picture of the mount but I have not found it yet.

 

John Love

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WD5IKX

That's very interesting.  I have a 10" OC OTA that has the rings that mount to the tube, but is lacking the ring cage that bolts to the mount.  I've been thinking about using Cave rotating rings and making radius blocks to adapt them to the OC Connoisseur mount, unless I can find an OC ring cage assembly for a 10".  

 

Interesting that the scope has a second ring cage near the sky end.  Was that to support cameras or some such?


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#4038 CCD-Freak

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Posted 09 January 2019 - 11:45 AM

That's very interesting.  I have a 10" OC OTA that has the rings that mount to the tube, but is lacking the ring cage that bolts to the mount.  I've been thinking about using Cave rotating rings and making radius blocks to adapt them to the OC Connoisseur mount, unless I can find an OC ring cage assembly for a 10".  

 

Interesting that the scope has a second ring cage near the sky end.  Was that to support cameras or some such?

 

Yes the upper ring cage was used with camera brackets and I think they also had a solar viewing screen.  I sadly don't know what happened to this scope...the observatory was torn down many years ago to make way for a housing subdivision.  I have not been able to find out where the scope went.  I hope it did not go to the scrap heap.  I remember it gave some very nice views.  BTW.....I am not 9' tall....can you say ladder? (^8

 

OC-10-Obs-CC College-sm.jpg

 

John Love

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WD5IKX


Edited by CCD-Freak, 09 January 2019 - 11:47 AM.

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#4039 Augustus

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Posted 09 January 2019 - 08:56 PM

I didn't really do anything to it, but I decided to keep my C90 Astro. I just like the scope too much, and now that I'm going to Florida in February I may be able to photograph a launch or two with it hooked up to my new DSLR.


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#4040 davidmcgo

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Posted 09 January 2019 - 09:03 PM

That is a great decision Augustus!  The ones with good optics are rare and it looks like a really nice kit with the Astro mount.  You will get more satisfaction from keeping it than the money you’d get for it from my experience.

 

Dave


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#4041 mattyfatz

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Posted 09 January 2019 - 11:32 PM

The Optical Craftsmen 8 inch with some close up shots.

I moved the telescope over to my Unistar for some Grab-N-Go winter observing.

The mirror cell you can see has extra long springs because the original mirror was f6.3 the new mirror is f/6

I wish I had the original but its actually 3 mirrors  gone, Parks now, when I bought the scope it had a Coulter

f/6 but the coatings are all gone. The Parks is fabulous. And I replaced the diagonal (coating gone) with a 

new old Novak 1.75" quartz.

Here's the super focuser all tuned up and super smooth.

This telescope is lightweight and well built and extremely sharp.

Robert

 

attachicon.gif post-50896-14073262413802_thumb.jpg

attachicon.gif IMG_8975.jpg

attachicon.gif IMG_8966.jpg

attachicon.gif IMG_8964.jpg

That Unistar is really something. Wish I grabbed one when I had the chance.


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#4042 clamchip

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Posted 10 January 2019 - 12:12 AM

That Unistar is really something. Wish I grabbed one when I had the chance.

Oh no it looks like they are going to cease production:

http://www.universalastronomics.com/

 

Robert 


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#4043 mattyfatz

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Posted 10 January 2019 - 03:03 AM

Yup. Already did I think.  I've been trying to get in touch with Larry to see if he has anything left. Soon those mounts will grace thee pages as classics.



#4044 terraclarke

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Posted 10 January 2019 - 02:10 PM

Yes, Larry closed up shop in 2017. He made great mounts for reasonable prices.



#4045 Steve Allison

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Posted 10 January 2019 - 06:10 PM

It's not what I did to it, but what I did for it.

 

I found a proper tray light for my Sears 6345 refractor and now have a complete kit as would have come from Sears originally. (Well, except for the cardboard box it in which it came).

 

The tray light has a magnetic base and can be positioned anywhere on the tray. Most tray lights on other telescopes are bolted to one edge of the tray.

 

My Tak FS-102NSV is perfection, but I'll be darned if the 45 year old Sears 90mm, F15.6 doesn'i nip at its heals for contrast and resolution.

 

Steve


Edited by Steve Allison, 10 January 2019 - 06:11 PM.

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#4046 clamchip

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Posted 10 January 2019 - 11:39 PM

It's about time I get out my Carton 4 inch f/15

The views are OMG clean and sharp, unforgettable.

The 4 inch f/15 achromat with it's 1524mm focal length is my favorite of all telescopes.

Robert

 

post-50896-0-36798200-1488159173_thumb.jpg


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#4047 clamchip

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Posted 11 January 2019 - 09:32 PM

I'd like to build a telescope for this unknown 5-3/4 inch f/14 lens.

https://www.cloudyni...cope-objective/

I was thinking with the acres of clams it has, have you ever seen so many clamchips, my god.

It will be a supercalifragilistic lens I'm pretty positive of that.

I think with this lens I'm going to depart from my usual 'test tube' visual analysis, and

do it scientifically with double pass auto collimation to see if I have a Willy Wonka gold certificate.

At f/14 and 5-5/8 inch clear aperture (lens is 5-3/4" diameter) I think the CA will fall within

acceptable levels, as much as I love purple.

Robert

 

post-50896-0-20998100-1522595547_thumb.jpg

post-50896-0-49443900-1522595559_thumb.jpg

post-2597-14073834301145_thumb.jpg


Edited by clamchip, 11 January 2019 - 09:34 PM.

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#4048 Bob Myler

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Posted 12 January 2019 - 09:45 AM

Robert - a 7/8" ring with an inside diameter of 4" - would nicely hide all those clams while rendering you a nearly color-free f/20 system....


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#4049 clamchip

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Posted 12 January 2019 - 09:37 PM

I'm in kinda a DPAC mood lately so I thought I would test my Brandt 6 inch to make sure the spacers

are the correct thickness. No worries though, this scope is insanely excellent, I've observed at over

1000X with it. But, there may be room for improvement.

As for as I got today is weighing the scope. I always wondered what it weighs, and now I know:

with tube rings and D size dovetail bar but no finder, 24 pounds 3 ounces.
My Optical Craftsman 8 inch f/6 full thickness fiberglass Newtonian weighs 21 pounds.

Robert

 

post-50896-0-73543100-1540144805.jpg


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#4050 mattyfatz

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Posted 12 January 2019 - 11:54 PM

                                 /\

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 you've got a lot of great photos... but this one might be my favorite 


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