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Favorite <60mm Scopes

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#1 pdxmoon

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Posted 21 April 2014 - 01:35 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! :jump:

#2 fjs

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Posted 21 April 2014 - 01:54 PM

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

Here's my 66TE-5:

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#3 CharlieB

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Posted 21 April 2014 - 02:37 PM

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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#4 CharlieB

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Posted 21 April 2014 - 02:43 PM

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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#5 CharlieB

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Posted 21 April 2014 - 02:48 PM

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

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#6 AllanDystrup

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Posted 22 April 2014 - 01:03 AM

Here's mine :

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#7 Bomber Bob

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Posted 22 April 2014 - 07:07 AM

These Small Classics are impressive!

#8 Chuck Hards

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Posted 22 April 2014 - 08:00 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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#9 terraclarke

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Posted 22 April 2014 - 09:18 AM

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

#10 Chuck Hards

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Posted 22 April 2014 - 09:27 AM

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.

#11 CharlieB

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Posted 22 April 2014 - 10:12 AM

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

#12 combatdad

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Posted 22 April 2014 - 11:11 AM

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

Dave

#13 Chuck Hards

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Posted 22 April 2014 - 12:02 PM

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.

#14 Bomber Bob

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Posted 22 April 2014 - 12:10 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?

#15 terraclarke

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Posted 22 April 2014 - 12:16 PM

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

#16 Chuck Hards

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Posted 22 April 2014 - 12:18 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?


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.

#17 t.r.

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Posted 22 April 2014 - 12:19 PM

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

#18 Chuck Hards

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Posted 22 April 2014 - 12:21 PM

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.

#19 Bomber Bob

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Posted 22 April 2014 - 12:49 PM

Thanks again, Chuck!

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

#20 bremms

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Posted 22 April 2014 - 02:44 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.

#21 photiost

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Posted 22 April 2014 - 03:59 PM


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.


Looks great !

#22 apfever

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Posted 22 April 2014 - 09:42 PM

This is Itsy Bitsy. "Itsy Bitsy - Teeny Weeny" was a hilarious line from a Bugs Bunny episode.

This is genuine Research Optical CO. 45mm aperture scope. The finder is optical also, not just a tube. I measured the finder objective at 10mm. The legs are in 5 collapsible sections that lock individually to adjust from a table top 12" to 44".

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#23 apfever

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Posted 22 April 2014 - 09:43 PM

The cradle has a built in compass.

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#24 pdxmoon

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Posted 22 April 2014 - 09:53 PM

Man, I am glad I started this thread! Half these scopes I never knew existed.

How hard is it to find those little Uni 142s? Did they make more or less of them because of size?

#25 roscoe

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Posted 23 April 2014 - 10:10 AM

While this is technically a spotting scope, in the years since I bought it new - the first scope I ever bought, in I think 1965, it has gathered more photons than all my other scopes combined.
It is a Monolux 20x40, I recently restored it, (as in...gave the OTA and glass a thorough cleaning...) and still use it often. The original metal table-top tripod has been gone for many years, I converted it to a camera mount by epoxying in a 1/4" t-nut. Nowadays, I'd do that a little more nicely...but I was about 15 at the time.....

Also, the first scope I ever restored was for a friend, a 50mm Tasco, that gave small but astonishing views of Jupiter and Saturn, way better than the generic 60 I owned at the time....

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