Because we don't need a new thread for every new arrival, I'll start this and post here. Post your new (and used) Questar acquisitions here if you wish.
I just finished a full takedown and cleaning of a failed Questar 700 lens yesterday, and made a video of the whole process. It came (cheaply $175 plus shipping accepted as my offer) "AS IS FOR PARTS OR REPAIR ONLY" and showed a foggy lens that I didn't realize at the time was as bad as it was, but which I still thought might be cleaned. I'm starting to think that the pattern of fog on interior optical surfaces is because of the outgassing of some adhesive (perhaps the baffle cone) or even the 100+ square inches of greased surface exposed to the interior.
I actually forgot about the fog until I was well into the process of dismantling for cleaning. I had removed and cleaned the corrector before, but never found the secret to separating the barrel from the base to access the mirror and field flattener lenses (It's under the rubber grip). My recent exploration into dismantling and restoring Nikon vintage manual camera lenses gave me a lot of insight and confidence.
In lieu of the obligatory photos, I'll post the link to the Youtube video, which ended up over an hour. It was especially fun because I was exploring places I'd never explored before.
PS: I just logged this in, and it's the sequential serial number of my first 700, and the latest 700 I have in my log of all sales I could find. Maybe I should make these into binoculars? (Seriously, a focusing mechanism with a big belt?) I have way too many 700s, but can't help it when there is a model in distress.
Edited by Optics Patent, 17 October 2019 - 05:35 PM.