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Post your home made scope

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#76 droid

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Posted 26 January 2013 - 10:46 AM

Nice scope Rutilus love the cage that holds the scope.
How does the Carton lens perform?

#77 Rutilus

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Posted 26 January 2013 - 05:59 PM

Andy - Since building and testing the Carton, I've found it to be a superb lens.

Racking both sides of focus I get a near identical star pattern with just the very
slighest hint of over-correction.
In focus, I get a tiny trace of C.A. on stars such as Vega and Sirius. Since the start of this year,
I've been able to observe Sirius B four times now, with Sirius being only 18 degrees altitude, the
amount of C.A. around the star is extremely tiny.

I did side by side testing with my Takahashi TSA-102 and a friends excellent FS-102.
With Jupiter I could not see a difference between all three scopes in terms of the planetary detail
observed. The Carton showed the festoons, great red spot, oval BA and rifts in the belts, every bit
as good as the Tak scopes.

The Carton is a fantastic double-star scope, again being the equal of the Tak's. I actually found
the F star in the Trapezium easier to see with the Carton.

The sharpness and contrast of the lens is excellent, with the albedo features and 4 to 5 bright craterlet
markings being easily visible within the Lunar crater Plato. On the night of a recent Full moon, I could
easily see different colouration hue's on the lunar surface.

I have been so pleased by this scope, that I have now sold my TSA-102, and used to the money to
fund the building of a Istar 6" f/15.

Here's a picture of the M.D.F. lens cell.

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#78 Tavi

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Posted 27 January 2013 - 08:16 AM

Hi!
There is all my home made equipment: 8" F/15 classical cassegrain, the 70 F/4 RFT ("The Steam Locomotive") and the Fraunhofer refractor 80mm F/11.25 and 6x30 finder, all suported by the heavy piston AZ mount on a cherry wooden tripod:

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The optical elements are not my work,they are bought new or second hand. The details of constructions are presented on my threads.
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#79 NHRob

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Posted 27 January 2013 - 12:55 PM

beautiful scopes! How do you like your classical Cass?

#80 droid

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Posted 27 January 2013 - 01:08 PM

Rob I was hoping you would see this thread, seen your ATM work in the past.

#81 NHRob

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Posted 27 January 2013 - 05:16 PM

Love these kind of threads!

#82 Dick Jacobson

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Posted 27 January 2013 - 07:39 PM

Here's my 14" equatorial Newtonian. Ever since I bought it as a Dob in 2001 I've been repeatedly rebuilding and remodeling it, trying out new ideas. The most unusual features of the current version are:
- a rotating secondary cage with seven focusers so I can change eyepieces in 2 seconds;
- the entire tube rotates on a single Lazy Susan;
- a truss-style mirror box with a "naked mirror" for faster cooling;
- vibration dampers (when I added the 7-focuser cage I doubled the weight of the tube without making the mount stiffer, so it developed a vibration problem);
- a fork equatorial mount with a pyramid shaped polar axis;
- low friction bronze or roller bearings carry all the weight, with additional friction provided by polyethylene pads against aluminum;
- two concentric polar axes using a Lazy Susan at the north end. A motor drives the inner ring of the Lazy Susan, while the outer ring is hand driven and rests against roller bearings (this was by far the hardest part!)

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#83 astrobeast1

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Posted 28 January 2013 - 02:35 AM

Hi Dick, I had seen just your secondary cage in another post, and thought it was an amazing concept and absolutely unique as far as I,m aware .Stunning piece of kit that .
Is your twenty the same ?

admiring Dan

#84 Dick Jacobson

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Posted 28 January 2013 - 08:34 AM

Hi Dick, I had seen just your secondary cage in another post, and thought it was an amazing concept and absolutely unique as far as I,m aware .Stunning piece of kit that .
Is your twenty the same ?

admiring Dan

Thanks, I am currently rebuilding the 20" along similar lines, except it will not have the rotating secondary cage. The rotating cage would be difficult to handle at that size and would be difficult to integrate with my periscope accessory. My original 20" build is described at 20" equatorial.

#85 droid

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Posted 28 January 2013 - 09:30 AM

Dick your 20 inch is phenominal, I hope youll post it here too.
You havent gone larger have you?

#86 PrestonE

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Posted 28 January 2013 - 11:43 AM

Hi Everyone,

Here is a pic of our 20 inch RC about to leave our old home in Houston.

It still is not at it's permanent home in Granite Gap, as they still do not have all of the utilities in and ready :bawling: :bawling: :bawling:

We have now been waiting for over 3 years :question:

Best Regards,

Preston

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#87 Dick Jacobson

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Posted 28 January 2013 - 01:25 PM

Dick your 20 inch is phenominal, I hope youll post it here too.
You havent gone larger have you?

I hope to have the rebuilt 20" done in a couple of months, then I'll post a picture. I've had thoughts of building something around 30" but it would most likely be an altazimuth on a built-in equatorial platform.

#88 StarWrangler

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Posted 28 January 2013 - 03:10 PM

Preston,

Now that is what dreams are made of!!

Alan O.

#89 ccaissie

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Posted 28 January 2013 - 03:37 PM

8" f/7 flex mirror scope. Clouded up before optical judging, but Bill Kelley (rest his soul) checked it out and was thrilled.

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#90 PrestonE

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Posted 28 January 2013 - 03:45 PM

Thanks Alan,

It is headed to the Texas Star Party again on the 5-12 of May and then :question: :question: :question:

Hopefully Granite Gap will have everything ready...

What good are 7.4 mag skys, if there is no internet for operating remotely :tonofbricks:

Best Regards,

Preston

#91 piaras

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Posted 28 January 2013 - 04:53 PM

This one started as a 90 Red tube Coulter Odyssey 13.1 and I have gone from a split tube to 8 tube truss to this. The only parts original are the base and primary mirror. The mirror is next in 30-60 days, Zambuto will be in it's place. I will make a new base and bearings more appropriate for the scope.

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#92 Tavi

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Posted 28 January 2013 - 05:48 PM

Thank you, Rob!
The classic cass is great! A little bit heavy (7.5Kg) but very strong, no need to recolimate frequently. The mirrors are from our local optician, Tavi Stanescu, the best choice for romanian ATM'ers. So, the sky is the limit of the beauty of its images. :)

#93 StarStuff1

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Posted 28 January 2013 - 06:22 PM

One more small project finished last year. A 70mm f/13 achro in a Berry style tube and mount riding on a re-furbished WW II tripod made of oak, brass and bronze.

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#94 droid

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Posted 29 January 2013 - 06:30 AM

piaras : nice rebuild(s) , do you have problems with the open design of your dob? mine is a six truss and is a nightmare near any bright lights at all.

#95 piaras

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Posted 29 January 2013 - 07:06 AM

I use a shroud to remove the stray light problems. I have used it without at times but making sure I have any light source at my back, and only a few times.
Pierre

#96 kfrederick

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Posted 29 January 2013 - 09:00 AM

A 20 inch f5 newt with a 20 inch f8 CHief

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#97 Sean Cunneen

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Posted 29 January 2013 - 11:42 AM

My latest... Still working on the dewshield but the rest is put together. This is my 3" f15.3 Brandon Refractor on an Edmund mount and Dietzen Tripod. The focuser is a custom brass Crawmach. I consider it a period-repro-franken scope.

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#98 droid

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Posted 29 January 2013 - 12:40 PM

Sean, looks a bit like an Edmund mount, the counter weight looks like the one my 6inch f/8 mount had.

#99 Sean Cunneen

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Posted 29 January 2013 - 12:44 PM

Yep, it sure is. Great heavy iron construction, built like a tank. Undermounted my 6" reflector, but for this job, it's a cinch!

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#100 StarWrangler

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Posted 29 January 2013 - 01:01 PM


Have fun at Texas Preston,


Alan O.

Thanks Alan,

It is headed to the Texas Star Party again on the 5-12 of May and then :question: :question: :question:

Hopefully Granite Gap will have everything ready...

What good are 7.4 mag skys, if there is no internet for operating remotely :tonofbricks:

Best Regards,

Preston








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