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Equipment Discussions >> ATM, Optics and DIY Forum

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SilentLight
super member
*****

Reged: 11/29/08

Loc: Los Angeles, CA
Re: Post your home made scope new [Re: KevinS]
      #6287641 - 01/02/14 01:33 PM Attachment (89 downloads)

Quote:

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




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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KevinS
super member


Reged: 12/27/11

Re: Post your home made scope new [Re: SilentLight]
      #6288054 - 01/02/14 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


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woodscavenger
sage


Reged: 08/20/13

Loc: Boise, ID
Re: Post your home made scope new [Re: KevinS]
      #6288857 - 01/03/14 01:04 AM

You can check out my latest addition.

http://scopescavengerastronomy.blogspot.com


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PhilHerring
super member


Reged: 12/06/09

Loc: -33.87800,151.19630
Re: Post your home made scope new [Re: KevinS]
      #6292535 - 01/04/14 07:02 PM

Quote:

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


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Norm Folkers
member


Reged: 03/26/08

Re: Post your home made scope new [Re: KevinS]
      #6324813 - 01/20/14 07:21 PM Attachment (68 downloads)

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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SilentLight
super member
*****

Reged: 11/29/08

Loc: Los Angeles, CA
Re: Post your home made scope new [Re: Norm Folkers]
      #6324846 - 01/20/14 07:40 PM

Quote:

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.


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Norm Folkers
member


Reged: 03/26/08

Re: Post your home made scope new [Re: SilentLight]
      #6324902 - 01/20/14 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.

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tim53
Postmaster
*****

Reged: 12/17/04

Loc: Highland Park, CA
Re: Post your home made scope new [Re: Norm Folkers]
      #6325769 - 01/21/14 09:32 AM

Quote:

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.


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KevinS
super member


Reged: 12/27/11

Re: Post your home made scope new [Re: SilentLight]
      #6326031 - 01/21/14 12:21 PM Attachment (48 downloads)

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.

Edited by KevinS (01/21/14 12:23 PM)


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m a r k o
member


Reged: 12/31/13

Loc: Croatia
Re: Post your home made scope new [Re: SilentLight]
      #6328948 - 01/22/14 05:26 PM Attachment (47 downloads)

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

Edited by m a r k o (01/22/14 05:36 PM)


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m a r k o
member


Reged: 12/31/13

Loc: Croatia
Re: Post your home made scope new [Re: m a r k o]
      #6328970 - 01/22/14 05:34 PM Attachment (41 downloads)

250mm f/5 on an EQ platform

Edited by m a r k o (01/22/14 05:35 PM)


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m a r k o
member


Reged: 12/31/13

Loc: Croatia
Re: Post your home made scope new [Re: m a r k o]
      #6328982 - 01/22/14 05:39 PM Attachment (37 downloads)

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.

Edited by m a r k o (01/22/14 05:39 PM)


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photiost
professor emeritus
*****

Reged: 12/14/06

Loc: Montreal, Canada
Re: Post your home made scope new [Re: m a r k o]
      #6333051 - 01/24/14 04:01 PM Attachment (43 downloads)

Here is my 15in f/5 with Fullum optics



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StarStuff1
Post Laureate
*****

Reged: 04/01/07

Loc: South of the Mason-Dixon Line
Re: Post your home made scope new [Re: photiost]
      #6333632 - 01/24/14 08:58 PM

Sweeeeet!

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Tavi
super member


Reged: 10/11/09

Loc: Romania, EU
Re: Post your home made scope new [Re: nicklane1]
      #6337502 - 01/26/14 08:07 PM

Awesome, mr.Ed!

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.



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!


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EricR
member


Reged: 06/10/08

Loc: California, USA
Re: Post your home made scope new [Re: Tavi]
      #6338715 - 01/27/14 12:46 PM Attachment (39 downloads)

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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herrointment
Post Laureate
*****

Reged: 03/12/11

Loc: North of Hwy. 64
Re: Post your home made scope new [Re: EricR]
      #6338759 - 01/27/14 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!


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Pinbout
Postmaster
*****

Reged: 02/22/10

Loc: nj
Re: Post your home made scope new [Re: herrointment]
      #6338773 - 01/27/14 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.

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Kraus
Pooh-Bah


Reged: 03/10/12

Loc: Georgia.
Re: Post your home made scope [Re: Pinbout]
      #6338829 - 01/27/14 01:51 PM


Hey eric-san,

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


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EricR
member


Reged: 06/10/08

Loc: California, USA
Re: Post your home made scope [Re: Kraus]
      #6339034 - 01/27/14 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).

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