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Equipment Discussions >> Classic Telescopes

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clintwhitman
Caveman
*****

Reged: 01/01/07

Loc: CALI SoEasyACavemanCanSlewIt
Re: Cave Astrola options, You pick new [Re: astro140]
      #6041265 - 08/23/13 05:50 AM Attachment (8 downloads)

I like your thread!! Interesting!
I have all this stuff.


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clintwhitman
Caveman
*****

Reged: 01/01/07

Loc: CALI SoEasyACavemanCanSlewIt
Re: Cave Astrola options, You pick new [Re: clintwhitman]
      #6041270 - 08/23/13 05:59 AM Attachment (7 downloads)

The Astrola AMA finder on my 1965 F8 Cave is the cream of the crop. At one time I think I owned 6 Cave finders from various years. Now am down to three now. All the Astrola Eyepieces are very nice also. I feel that during the 1960s Cave really hit the mark with all of the equipment they sold. The front row, 4 of them are the original Astrolas that were purchased from Cave in 1965 with my 10" F8
Tri-Plane 6mm, 9mm ortho, 12mm, 26mm, Out of the 4 eyepieces the 12mm has put up some very very good images. It has a sweet spot that is scary sometimes.

Edited by clintwhitman (08/23/13 06:10 AM)


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clintwhitman
Caveman
*****

Reged: 01/01/07

Loc: CALI SoEasyACavemanCanSlewIt
Re: Cave Astrola options, You pick new [Re: clintwhitman]
      #6041281 - 08/23/13 06:17 AM Attachment (8 downloads)

Some of the other options Cave offered were focusers. The original Rukes focusers while crude are some of my favorites. Why? Because they were made by the "Little old Lady from Pasadena"
Look!! I got the 10th one they made!! Wow? Well that could mean it was supposed to get put on my 10" scope I suppose.


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clintwhitman
Caveman
*****

Reged: 01/01/07

Loc: CALI SoEasyACavemanCanSlewIt
Re: Cave Astrola options, You pick new [Re: clintwhitman]
      #6041295 - 08/23/13 06:35 AM Attachment (10 downloads)

My "SKY GIANT STORY"
Some years ago I rebuilt an older upgrade focuser "The Sky Giant" for the Cave. I had it finished as in the photo. Then someone needed one for a restoration they were doing on a 12" Cave from the 1960s so I sent it to them. 2 years later I received a brand new unused Sky Giant in the mail without a note or anything?
(If you read this and it was you Say Something!!)
So at this point I have a brand new, period correct, upgrade "Sky Giant" Focuser sitting on a shelf and so far I cannot bring myself to modify the original Cave as it came from the factory.
(aveman


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apfever
Carpal Tunnel
*****

Reged: 05/13/08

Loc: Colorado
Re: Cave Astrola options, You pick new [Re: clintwhitman]
      #6041523 - 08/23/13 09:51 AM Attachment (6 downloads)

Sheesh Clint,

I didn't know the Sky Giant was an option, I have one of those too. It came with my 8" Astroscopics.

I haven't had time to get photos. The two focusers I'm trying to choose between are Both original Cave put on their scopes. One is a beauty standard 1.25" and the other the Carle Helical Photo with all the adapters and paper work.

Here is the standard. This one is nice.
I'll have to get to the shed for the Carle, I think it's somewhere behind the slop buckets.


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turk123
Pooh-Bah
*****

Reged: 07/09/10

Loc: N.E. Ohio
Re: Cave Astrola options, You pick new [Re: clintwhitman]
      #6041607 - 08/23/13 10:38 AM Attachment (9 downloads)

Here is the patent paperwork for the Skymicro (public record).

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tim53
Postmaster
*****

Reged: 12/17/04

Loc: Highland Park, CA
Re: Cave Astrola options, You pick new [Re: turk123]
      #6043233 - 08/24/13 09:34 AM Attachment (4 downloads)

I have the Sky Micro Giant on the 12.5" Cave. I rebuilt it along with a 1 1/4" Sky Micro that I'm planning on using with one of my OC OTAs at some point. The Sky Micro on the OC Connoisseur is sweet! I love the adjustability of these focusers. They can be dialed in so smooth!

Here's the big one on the big Cave:


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terraclarke
Post Laureate
*****

Reged: 05/29/12

Loc: Just South of the Mason-Dixon ...
Re: Cave Astrola options, You pick new [Re: apfever]
      #6043306 - 08/24/13 10:26 AM

Quote:

Did Cave make sets of mirrors specifically for other scope manufacturers? If so, might it be possible to identify such a mirror in another scope?





They also re figured mirrors for individuals. When I could never get the parabola right on my 6" F4.5 I sent it off to Cave and they figured, aluminized, and coated it for me. They also sent me an 1/8 wave elliptical flat of the appropriate size for the mirror's F-Ratio.


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turk123
Pooh-Bah
*****

Reged: 07/09/10

Loc: N.E. Ohio
Re: Cave Astrola options, You pick new [Re: tim53]
      #6043843 - 08/24/13 03:52 PM

Quote:

I have the Sky Micro Giant on the 12.5" Cave. I rebuilt it along with a 1 1/4" Sky Micro that I'm planning on using with one of my OC OTAs at some point. The Sky Micro on the OC Connoisseur is sweet! I love the adjustability of these focusers. They can be dialed in so smooth!

Here's the big one on the big Cave:




Hi Tim

I have the same sky micro. It is not very smooth which makes me think it is out of round (dropped). Any ideas how to get it round again?


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tim53
Postmaster
*****

Reged: 12/17/04

Loc: Highland Park, CA
Re: Cave Astrola options, You pick new [Re: turk123]
      #6043884 - 08/24/13 04:28 PM

Ouch! I would think you'd want to put it in a lathe and measure for runout. Probably the drawtube is bent if anything is.

I've been known to straightn things with a rawhide mallet while rotating them slowly and watching a dial gauge. Not optimal, perhaps, but if it is bent it might be TG only thing to do, short of machining a replacement.

It would be neat if someone were to reproduce the sky micros, but I suspect the market isn't there for that.

Tim


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tim53
Postmaster
*****

Reged: 12/17/04

Loc: Highland Park, CA
Re: Cave Astrola options, You pick new [Re: tim53]
      #6043894 - 08/24/13 04:31 PM

iPhones are strange!

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Datapanic
Carpal Tunnel
*****

Reged: 10/17/09

Loc: Tucson, Arizona
Re: Cave Astrola options, You pick new [Re: tim53]
      #6043968 - 08/24/13 05:21 PM

The pinion shaft on my Sky Micro Giant was a little bit bent causing uneven tension when focusing. I was able to straighten it out a little and tweak the bushings which improved it, but it still needs some more work. It is usable, and as Tim said, they can be dialed in very smoothly.

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amicus sidera
Post Laureate
*****

Reged: 10/14/11

Loc: East of the Sun, West of the M...
Re: Cave Astrola options, You pick new [Re: Datapanic]
      #6044923 - 08/25/13 10:27 AM

Lots of great information on this thread!

Reading and learning...

Fred


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apfever
Carpal Tunnel
*****

Reged: 05/13/08

Loc: Colorado
Re: Cave Astrola options, You pick new [Re: amicus sidera]
      #6045463 - 08/25/13 04:17 PM Attachment (3 downloads)

Well hijacked and my own fault. At least I remembered to get the Carle picture and get back here. I forget things. I was also busy this morning looking at an 8" F7 Newt that was bult in 1939. The mirror had the Clausing sticker dated 04-02-39. Oh, now I'm hijacking my own. Never mind this morning.

Here is a picture of the Carle photography helical focuser offered by Cave. This would include the original paper, and collimation cap and T ring adapter. The cap and adapter were optional and shown on the paper.

This is in great condition and everythiing works well. It is nicer than the lousy picture shows (or doesn't show - dark). Everything including the paper just needs a dusting or wipe.

The choice would be between this one or the 1.25" I showed in this string way back when. I'm beginning to wonder if I need to ask which you'd choose, but go ahead and why?


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Datapanic
Carpal Tunnel
*****

Reged: 10/17/09

Loc: Tucson, Arizona
Re: Cave Astrola options, You pick new [Re: apfever]
      #6045493 - 08/25/13 04:36 PM Attachment (3 downloads)

The Carle focuser is photo-visual - obviously meaning that it has enough in/out focus travel for prime focus photography and visual. It is a pretty cool focuser and the helical focus method allows very fine focus plus will not roll out of focus if there's a lot of weight on it from a camera.

For only $23.50 ppd. - how can you go wrong!

But it is 1.25", I prefer the Novak 2" helical focuser myself. But I don't think it was resold by Cave.


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apfever
Carpal Tunnel
*****

Reged: 05/13/08

Loc: Colorado
Re: Cave Astrola options, You pick [Re: apfever]
      #6045503 - 08/25/13 04:43 PM

Here's the side by side, and my choice of finders which I found surprising.

Both have the same mechanical approach. Both are in equal condition. Both are the same magnification and aperture. EITHER one by itself would perform admirably. The side by side comparison shows definate differences.

1. The HOC is longer and will fit in either scope. The shorter AvA will not span the rings for the HOC.

2. The HOC has a noticable larger AFOV (aparent field of view). Since the powers are the same, the HOC has a noticable larger TFOV (true field).

3. The HOC has no ring of fire or blue hue. The view is uniform to the sharp field stop. The AvA has a nice sharp field stop, but a blue hue ring. The ring is minor but there.
Quickly moving from one finder to the next, it can be seen that the HOC has a truer whiter view. This is very subtle, but there.

4. The HOC has better resolution. Seriously. This was a day test on two rows of truss style high voltage interstate electrical towers. I have two runs of these, one row several miles away, and another further row about 10 miles out. I use these frequently for detail on the tower truss structure, suspended insulators, and tension lines. The HOC won with easy to see detail. Both were VERY good (I have experience using these towers), but the HOC won on the first comparison look through both finders at best focus. This did not take a back and forth scrutiny.

The HOC wins.

Now I have no intentions of opening any indeterminate bucket of worms from another subject so I'll meekly mention: HEY!! HOW ABOUT THEM THAR JAPANESE SYMBOL DOO DADS AND WHO MADE WHAT WHEN WHERE? AND DOCUMENTED CONFIRMED SOLID DESIGNATIONS AND AND ALL THAT, AND HOC? or not.


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tim53
Postmaster
*****

Reged: 12/17/04

Loc: Highland Park, CA
Re: Cave Astrola options, You pick new [Re: Datapanic]
      #6048779 - 08/27/13 12:59 PM

Quote:

The Carle focuser is photo-visual - obviously meaning that it has enough in/out focus travel for prime focus photography and visual. It is a pretty cool focuser and the helical focus method allows very fine focus plus will not roll out of focus if there's a lot of weight on it from a camera.




Holy capeevy dust! Is that what the screw on the side of the base of the Carle is for?? I thought the outside was machined so you could clamp a camera adapter to it! I had no idea it moved!



-Tim.

Edited by tim53 (08/27/13 01:00 PM)


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Datapanic
Carpal Tunnel
*****

Reged: 10/17/09

Loc: Tucson, Arizona
Re: Cave Astrola options, You pick new [Re: tim53]
      #6049593 - 08/27/13 08:16 PM

Quote:

Quote:

The Carle focuser is photo-visual - obviously meaning that it has enough in/out focus travel for prime focus photography and visual. It is a pretty cool focuser and the helical focus method allows very fine focus plus will not roll out of focus if there's a lot of weight on it from a camera.




Holy capeevy dust! Is that what the screw on the side of the base of the Carle is for?? I thought the outside was machined so you could clamp a camera adapter to it! I had no idea it moved!

-Tim.




I never had one before and it didn't occur to me that was how it worked either until I took it apart to paint it when I was overhauling the Cave 8" RFT. After that, it was one of those Aha! moments and the "Photo" part of Photo/Visual was realized. Originally, that tube part was stuck in there tight because of years of dust and dirt and didn't slide in or out easily at all.

I was really surprised that it was positioned just right to get prime focus with my DSLR - it was close as you can see from the picture. But it works. A Web Cam has no problem with it either.


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