Post your home made scope
Posted 03 March 2013 - 04:27 AM
Posted 07 March 2013 - 11:00 PM
- Chassetter and gitane71 like this
Posted 08 March 2013 - 07:22 AM
- Chassetter likes this
Posted 08 March 2013 - 07:25 AM
Posted 08 March 2013 - 10:43 AM
Living in SE Penna.,Edmunds wasn't too far away. Their retail store had orders of magnitude of more "stuff" than their catalog. Going there was like going to a candy store. I think my first purchase was a set of lenses to make a finder for my homemade 3" Reflector along with a 10 lens experimenters kit. Sorry for no pictures, they didn't have digital toys and computers back then in 1957.
Best Christmas present ever!
Posted 08 March 2013 - 12:51 PM
Posted 09 March 2013 - 12:09 PM
Awesome scope, with a curved spider and small secondary , it ought to approach apo like images.
Thank, Andy. I set it up last night at the Michigan City Library and first time public viewers had no trouble seeing the red spot, Ganymede as a disk, and detail in Jupiter's belts. Of all my scopes this 6in-f12 Newtonian has the sharpest image. It resolves better than my old 8in-f11 Newtonian; both have under 15% obstruction and curved spider. The difference is that I rouge-polished this 6" mirror till my green laser pointer penetrated the surface without a trace. Now I am a believer that, while general surface accuracy is important, the quality of the polish is equally important.
Posted 09 March 2013 - 12:19 PM
Glad it works so good. I was always going going to make one, but alas it never happened
If you would like to read Garys article:
Posted 11 March 2013 - 07:53 PM
10" all-fiberglass Dobs I built in the late 80's to early 90's.
My "Woodshop" Dob scopes from 1998:
- Chassetter likes this
Posted 11 March 2013 - 09:27 PM
meade ds90 tube with 2" meade focuser.
Folded mirror scope mod to night vision 8mm camcorder via standard eyepiece reflectors, extention tubes and a
25mm x 130mm achromat to refocus
Posted 12 March 2013 - 07:29 AM
Posted 12 March 2013 - 07:41 AM
Beautiful fiberglass scopes, Chuck! I'll bet they were lightweight too.
Some were lightweight, some weren't as light as they could have been, depending on the primary mirror and accessories the individual owners wanted. For example, some of them had 2" thick primary mirrors from Intermountain Optics and heavy-duty Novak cells, some had that heavy, 8x50mm finder that Edmund used to sell in those days. Each had different counterweighting requirements. Any needed balance weight was in the form of lead shot that was over-laminated into the scope interior. Production numbers reached double-digits before the birth of my daughter put a damper on telescope making temporarily.
I contacted S&T at the time, when Roger W. Sinnott was editing the Gleanings dept. IIRC, he liked the scope but felt that making fiberglass patterns and molds didn't have enough appeal to the average ATM, so the article was never written.
Posted 12 March 2013 - 09:19 AM
Posted 14 April 2013 - 12:17 AM
- gitane71 likes this
Posted 15 April 2013 - 09:24 PM
Here is my Convertible Newton 16" f4 to Cassegrain 16" f20, this is the Newtonian version on a new CPC mount, the Cassegrain version now is mounted on a Titan mount.
Posted 17 April 2013 - 11:12 AM
Might leave the tube bare. I was going to try and anodize the the cells but the lens cell is 7075 and 7075 does not anodize really well. Bare it is for now, I have a couple tubes that might get powder coated.
Nice work, Right after aluminum is machined it will easily buff out to a chrome-like finish. If you wait too long the natural anodizing will make buffing difficult.
Just a thought.