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Equipment Discussions >> Classic Telescopes

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pdxmoon
Pooh-Bah
*****

Reged: 06/27/13

Loc: Oregon
Favorite <60mm Scopes new
      #6479271 - 04/21/14 02:35 PM

In talking about my little 50mm Tasco purchased from the Bay, I was surprised to find out how many of you have less than 60mm scopes.

Would love for you to share. Pictures, pleeeze!


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fjs
Pooh-Bah
*****

Reged: 03/25/13

Loc: Olympic Peninsula, USA
Re: Favorite <60mm Scopes new [Re: pdxmoon]
      #6479309 - 04/21/14 02:54 PM Attachment (18 downloads)

Favorite? I don't know. I really haven't given the Tower50 a fair shake.

Here's my 66TE-5:


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CharlieB
Carpal Tunnel
*****

Reged: 12/11/07

Loc: Southern NH
Re: Favorite <60mm Scopes new [Re: fjs]
      #6479390 - 04/21/14 03:37 PM Attachment (20 downloads)

Here are the 50mm scopes minus the Mirador 50/750 (RAO R-51) that's being restored. My favorites are the Unitron 105 (50/700) or the Hy-Score 457 (50/500), although the Mirador my become my favorite judging from a few short sessions under the sky.

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CharlieB
Carpal Tunnel
*****

Reged: 12/11/07

Loc: Southern NH
Re: Favorite <60mm Scopes new [Re: CharlieB]
      #6479401 - 04/21/14 03:43 PM Attachment (16 downloads)

In the 40mm long focal ratio range, it's a toss up between the Unitron 127 (40/700) and the SPI (40/800). The two short scopes are both Astro Optical 40/500 scopes of superb quality. The little black 40mm tabletop on the bottom left was a real surprise. It's a Jupiter (Asahi) and although it's a fixed eyepiece spotting scope, the views are excellent. It's about an f/8 or so.

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CharlieB
Carpal Tunnel
*****

Reged: 12/11/07

Loc: Southern NH
Re: Favorite <60mm Scopes new [Re: CharlieB]
      #6479414 - 04/21/14 03:48 PM Attachment (14 downloads)

700mm Unitwins - 40mm and 50mm. The 40mm is an incredibly well built scope and has exceptional optics.

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AllanDystrup
sage
*****

Reged: 09/27/12

Loc: Denmark
Re: Favorite <60mm Scopes new [Re: CharlieB]
      #6480437 - 04/22/14 02:03 AM Attachment (21 downloads)

Here's mine :

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Bomber Bob
Carpal Tunnel
*****

Reged: 07/09/13

Loc: The Deep South, USA
Re: Favorite <60mm Scopes new [Re: AllanDystrup]
      #6480698 - 04/22/14 08:07 AM

These Small Classics are impressive!

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Chuck HardsModerator
Post Laureate
*****

Reged: 05/03/10

Loc: The Great Basin
Re: Favorite <60mm Scopes new [Re: Bomber Bob]
      #6480783 - 04/22/14 09:00 AM

My home made 50mm f/20.

The only pic I have handy is this one, showing the OTA on the bench, in front of a Jaegers 110mm f/4.5 build from last year. I'll try and remember to take a pic next time it's on a mount.



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terraclarke
Post Laureate
*****

Reged: 05/29/12

Loc: Just South of the Mason-Dixon ...
Re: Favorite <60mm Scopes new [Re: Chuck Hards]
      #6480896 - 04/22/14 10:18 AM

Wow! With a PVC (?) tube that long, do you get any sag or is it aluminum?

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Chuck HardsModerator
Post Laureate
*****

Reged: 05/03/10

Loc: The Great Basin
Re: Favorite <60mm Scopes new [Re: terraclarke]
      #6480915 - 04/22/14 10:27 AM

Quote:

Wow! With a PVC (?) tube that long, do you get any sag or is it aluminum?




Terra, it's aluminum. Only the lens cell and dewcap are PVC.


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CharlieB
Carpal Tunnel
*****

Reged: 12/11/07

Loc: Southern NH
Re: Favorite <60mm Scopes new [Re: Chuck Hards]
      #6480975 - 04/22/14 11:12 AM

That's a great looking scope! Where did you find the objective?

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combatdad
professor emeritus


Reged: 12/28/12

Loc: Culpeper, VA
Re: Favorite <60mm Scopes new [Re: CharlieB]
      #6481087 - 04/22/14 12:11 PM

Nice pictures and a very impressive under 60mm collection, Charlie

Dave


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Chuck HardsModerator
Post Laureate
*****

Reged: 05/03/10

Loc: The Great Basin
Re: Favorite <60mm Scopes new [Re: CharlieB]
      #6481181 - 04/22/14 01:02 PM

Quote:

That's a great looking scope! Where did you find the objective?




Thanks!

It's been so long that provenance is lost (I forgot!). It was either American Science & Surplus, Surplus Shed, Gary Hand, or maybe Paul Rini. I'm thinking about 15 years ago or so.

It's a cemented doublet with a nice violet anti-reflection coating, and the imagery is tack-sharp with almost no spurious color, even on the full moon.

I've been looking for another ever since, without success.

I lathe-turned an Antares 1.25" focuser down to fit the aluminum tube, added aftermarket knobs.


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Bomber Bob
Carpal Tunnel
*****

Reged: 07/09/13

Loc: The Deep South, USA
Re: Favorite <60mm Scopes new [Re: Chuck Hards]
      #6481197 - 04/22/14 01:10 PM

Chuck, I really like your 50mm rebuild!

Question: When you're getting ready to cut the OTA tube, how much length do you allow for the focuser drawtube?


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terraclarke
Post Laureate
*****

Reged: 05/29/12

Loc: Just South of the Mason-Dixon ...
Re: Favorite <60mm Scopes new [Re: Bomber Bob]
      #6481206 - 04/22/14 01:16 PM

That is a very cool 50/F20 you built Chuck. It would make a great h-alpha solar scope.

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Chuck HardsModerator
Post Laureate
*****

Reged: 05/03/10

Loc: The Great Basin
Re: Favorite <60mm Scopes new [Re: Bomber Bob]
      #6481208 - 04/22/14 01:18 PM

Quote:

Chuck, I really like your 50mm rebuild!

Question: When you're getting ready to cut the OTA tube, how much length do you allow for the focuser drawtube?




Thanks!

I get the eyepiece requiring the most IN travel, usually a very short FL ortho, stick it in a star diagonal and then put that in the focuser, and position the drawtube with about an inch of IN travel left. I then mock-up the scope. I space the objective and focuser until an object at infinity (typically a mountain peak at least 10 miles away) is in focus. That gives me the final tube cut length.

1.25" star diagonals typically take about 2" of IN travel, that leaves me with 3" of IN travel with no star diagonal, and 1-1/2"-2" of OUT travel for eyepieces with the focal plane near the end of the 1.25" barrel.

Usually works well in practice. If I'm using a focuser with more than 4" or 5" of drawtube travel, I'll leave more than an inch of remaining IN travel with my shortest FL eyepiece.


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t.r.
Post Laureate
*****

Reged: 02/14/08

Loc: Upstate NY
Re: Favorite <60mm Scopes new [Re: terraclarke]
      #6481212 - 04/22/14 01:19 PM

Love that Zeiss Allan...quite a little powerhouse!

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Chuck HardsModerator
Post Laureate
*****

Reged: 05/03/10

Loc: The Great Basin
Re: Favorite <60mm Scopes new [Re: terraclarke]
      #6481213 - 04/22/14 01:21 PM

Quote:

That is a very cool 50/F20 you built Chuck. It would make a great h-alpha solar scope.




Thanks Terra. Along the same line of thought, I've got a 50mm plano-convex lens that is about f/40 and would do well for h-alpha, since only a single wavelength is used.


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Bomber Bob
Carpal Tunnel
*****

Reged: 07/09/13

Loc: The Deep South, USA
Re: Favorite <60mm Scopes new [Re: Chuck Hards]
      #6481282 - 04/22/14 01:49 PM

Thanks again, Chuck!

I've added that to my "ATM Notes" file.


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bremms
Carpal Tunnel
*****

Reged: 08/31/12

Loc: SC
Re: Favorite <60mm Scopes [Re: Bomber Bob]
      #6481511 - 04/22/14 03:44 PM

50mm 600fl Jupiter. The 50mm F5 Edmund lens as the finder for my 4" Jaegers. It gives a good image of Jupiter with a 5mm EP.

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