I spent a delightful couple of hours at apfever's today. First thing encountered was the mirror box of a 36" truss dob. Many more wonderful instruments of astronomical exploration were present, but my focus was on a Goto 8" reflector that Neil first displayed here towards the end of 2014. He graciously parted with it today and I will be spending quite a bit of time on it going forward. We were able to sort out quite a bit about the scope, and there will be a lot of additional research on my part. For the most part though, after enjoying the Edmund Super Space Conqueror 6" f/8 I got last week, what better could one do who appreciates Goto telescopes but acquire a little more aperture and a Goto at that.
Quick take is the mirror is 210mm, focal length 1575 or f/7.5. Neil originally estimated f/7. Mirror is 1.25" thick. The back of the mirror (doesn't photograph well at all) says Goto, 1959 3, and an F number that I thought might be focal length but now think is likely a serial number - F3235. The tube is heavy walled and heavy, period. It reminds me of some of the early Russian Mak Newts. Neil pointed out the interesting collimation screws in his earlier thread, and really the cell is one of the more interesting aspects of the scope. Some serious thought will be required as to actually creating a structure that will settle given that all is enclosed.
I only acquired the OTA and the eyepieces. The finder was not original and I did not take that, nor the Magnuson mount. The goal will be to restore the tube and look at fabricating a mount similar to the one in the 'instruction' sheet that Neil posted in his earlier thread and that accompany the Mod 205 4.5" and Mod 206 6". Since I think this is easily a 200 series scope I am tentatively going to call it a Mod 207. A couple of pictures follow, but also a link to Neil's presentation of the scope to CN in 2014. And I'll repost the couple of pics he posted in the Mod 204 thread which I'm sure raised some eyebrows.
Link to apfevers original post - https://www.cloudyni...or#entry6597203
The first is the scope with mirror cell removed and inverted on the top of the tube for storage. How I found it standing tall among many other tubes standing tall.
These are the eyepieces. I did not take the erector T30 eyepiece and it predates my refractors and I don't believe it was part of original acquisition. I'm sure you will all see it again real soon.
Finally the focuser that terraclark nailed in the quiz Neil posted as a Goto and quickly came to the conclusion it was a Goto newt.
And the tube with the bogus finder (and plastic mount )
I'll get the mirror back in the cell and the cell back in the right end of the tube and see how the optics perform. Need some rings before I can get it on the heavens.
Edited by Stew44, 25 July 2017 - 09:52 PM.