12.5" Mirror

I have recently purchased a 12.5" f/6.7 mirror through Obsidian Optics. I got a great deal for pyrex wavefront 1/15 or better, which I guess is making me a little nervous. Has anyone out there ever dealt with this company or its' owner Mark Cowen? Just need a little reassurance as this was a big purchase for me.
Thanks
Todd

Todd,

Mark is making some good mirrors at a reasonable price. He had some delivery problems but seems to be making progress working down the backlog. I've got a 10" of his that is very good. Don't expect overnight delivery. I think most glass pusher are optimistic on delivery schedules.

Brad

I recently had the opportunity to examine and test a friend's new Obsidian 16" f/4.5. I was impressed by the quality of the polish--there was absolutely no scatter from a green laser pointer shined on the surface. The figure was also very smooth and the edge looked perfect. My Foucault results differed slightly from the maker's in the central zone, but still showed a very well corrected figure--something like 0.96 or 0.97 Strehl ratio (I don't have the numbers in front of me). I would say Obsidian is making very good optics, although it took them about a year to deliver that mirror.

Cheers,

Michael Mills