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#501 SilentLight

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Posted 02 January 2014 - 01:33 PM

Surplus Shed 127mm x700mm F5.5 Achromat
mounted in marine diesel air intake tubing w homemade heater strips and modified reflector focuser


:waytogo: A heck of a lot nicer looking than my all-PVC SS 127/f5.5. I bet it's a lot lighter than mine, too.

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#502 KevinS

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Posted 02 January 2014 - 04:39 PM

Nice work!
If I could of figured out how to get that light cone in a 4" PVC pipe I would have jumped on it. Major $aving

#503 woodscavenger

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Posted 03 January 2014 - 01:04 AM

You can check out my latest addition.

http://scopescavenge...my.blogspot.com

#504 PhilHerring

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Posted 04 January 2014 - 07:02 PM

Originally, It was a Rustoleum Metallic Orange that I tried real hard to make work because it looked so nice. But I've given up. The stuff just stayed soft even after weeks of drying so I have ordered a CF looking vinyl wrap.


I find enamel paint stays soft and sticky for weeks, so these days I bake it in a slow oven. 80 degrees C, or thereabouts, for 4 or 5 hours hardens it up very nicely. (It helps to have a tolerant partner :)

#505 Norm Folkers

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Posted 20 January 2014 - 07:21 PM

I have the 900mm verion of that lens from the same supplier. But I did not just make the OTA from 4" ABS fittings, it also includes the rest of the equatorial mount. Consider it a Springfield like refractor with a fixed eyepiece position. It does require using 2 elliptical diagonals. Sitting down and observing is a treat. I use a laser to "line up" the objects I want to observe. But often I just start somewhere and pan around. The upper end of the OTA is screwed into the first T fitting. This allows other focal length lenses with their customized upper tube to be screwed into place and thus observe with different objectives, both different in focal ratio or smaller (127 mm) is the max practical objective aperture. So you can use ABS, don't know about PVC, for these objectives.

Norm

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#506 SilentLight

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Posted 20 January 2014 - 07:40 PM

I have the 900mm verion of that lens from the same supplier. But I did not just make the OTA from 4" ABS fittings, it also includes the rest of the equatorial mount. Consider it a Springfield like refractor with a fixed eyepiece position. It does require using 2 elliptical diagonals. Sitting down and observing is a treat. I use a laser to "line up" the objects I want to observe. But often I just start somewhere and pan around. The upper end of the OTA is screwed into the first T fitting. This allows other focal length lenses with their customized upper tube to be screwed into place and thus observe with different objectives, both different in focal ratio or smaller (127 mm) is the max practical objective aperture. So you can use ABS, don't know about PVC, for these objectives.

Norm


What size diagonals did you use? I have one of those lenses as well and am thinking of making a boxed version of what you have made, but in an alt-azimuth configuration.

#507 Norm Folkers

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Posted 20 January 2014 - 08:08 PM

The larger of the two diagonals is 4" minor axis. It just fits. The second one is 1.5". Each is located in one of the two T fittings. The whole thing is a little harder to collimmate because of the two diagonals, but with lasers and targets it becomes much easier.

#508 tim53

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Posted 21 January 2014 - 09:32 AM

I have the 900mm verion of that lens from the same supplier. But I did not just make the OTA from 4" ABS fittings, it also includes the rest of the equatorial mount. Consider it a Springfield like refractor with a fixed eyepiece position. It does require using 2 elliptical diagonals. Sitting down and observing is a treat. I use a laser to "line up" the objects I want to observe. But often I just start somewhere and pan around. The upper end of the OTA is screwed into the first T fitting. This allows other focal length lenses with their customized upper tube to be screwed into place and thus observe with different objectives, both different in focal ratio or smaller (127 mm) is the max practical objective aperture. So you can use ABS, don't know about PVC, for these objectives.

Norm


Beautiful! I've wanted to do something like this for a long time.

-Tim.

#509 KevinS

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Posted 21 January 2014 - 12:21 PM

The latest iteration of this "practice build".
I fabricated a slide-on dew shield using 3/4 plywood and 7" tubing.
All tubing is aluminum with 3M PVC outdoor wrap. Interior of dew shield is Protostar flocking.
Mulling over a built-in 4" sliding focuser for the next phase.

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#510 m a r k o

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Posted 22 January 2014 - 05:26 PM

Here are my two finished scopes, they are both truss-tube dobsons with primary mirrors taken from stock solid tube GSO dobsons.

200mm f/6

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#511 m a r k o

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Posted 22 January 2014 - 05:34 PM

250mm f/5 on an EQ platform

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#512 m a r k o

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Posted 22 January 2014 - 05:39 PM

The distance form the mirror to the focuser can be adjusted so a binoviewer with no corrector will come to focus or lengthened so a single eyepiece focuses.

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#513 photiost

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Posted 24 January 2014 - 04:01 PM

Here is my 15in f/5 with Fullum optics

:cool:

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#514 StarStuff1

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Posted 24 January 2014 - 08:58 PM

Sweeeeet!

#515 Tavi

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Posted 26 January 2014 - 08:07 PM

Awesome, mr.Ed! :bow:

I just built a simple large field finderscope, right from the scrap box:

Objective: 50mm binocular objective
Eyepiece: WA 60deg binocular 30mm FL
Tube: old copier image cilinder, a former drawtube of my 80x900mm refractor.

Posted Image

The good quality of the optics and a black velour coating inside and you get a beautiful clear image. What a pitty the sky is cloudy-snowdy! :p

#516 EricR

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Posted 27 January 2014 - 12:46 PM

Here are a couple of home-made 17.5" f/5 Dobs that I built like 12+ years ago. Both have custom-ordered Discovery optics that I'm very happy with. Other than that, they're pretty much Obsession clones with just minor design differences. I still use one of them. Now just starting a 22" f/3.23 project that I expect to complete later in 2014 (but no pictures yet).

The URL to my lame/neglected web site is listed in my CN user profile and there are a few construction pictures there, but nothing too exciting.

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#517 herrointment

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Posted 27 January 2014 - 01:08 PM

Nice lookin' dobs, Eric.

You are averaging over one post per year.......this is actually a good thing which some of us should try to emulate!

Cheers!

#518 Pinbout

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Posted 27 January 2014 - 01:13 PM

no he just posted like 4 posts showing his very nice split block connectors, so its really like 1 post every 2 years.

#519 Kraus

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Posted 27 January 2014 - 01:51 PM


Hey eric-san,

You ought to pair those up and make one heck of binoculars.

#520 EricR

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Posted 27 January 2014 - 03:39 PM

Ha ha... When I was ordering the 2 sets of optics, the guy I talked to did ask, "Whatcha building? Giant binoculars?" As for number of posts, yeah; I don't find myself getting too much time to spend in the forums very often but have been researching a bunch of stuff so actually have been reading/posting a bit lately (for a change).

#521 woodscavenger

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Posted 28 January 2014 - 12:00 AM

Eric, whats in the short section of sono tube?

#522 EricR

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Posted 28 January 2014 - 02:18 PM

The "Quick Tube" thing is the case/carrier for my UTA. Top and bottom are plywood circles. The inside is lined with felt and I have spots inside to hold my Telrad (just extra Telrad base screwed to the bottom inside) and my encoder arms.

#523 bbbriggs

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Posted 31 January 2014 - 09:36 PM

18" equatorial mounted newt.

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#524 R Botero

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Posted 01 February 2014 - 03:04 AM

Beautiful! :photo: did you make both?

#525 bbbriggs

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Posted 01 February 2014 - 09:44 PM

It belongs to my brother and yes he machined the whole thing including the mount.






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