Hi all, this is my first post in 12 years. I'm an old atm who built dobs back in the 90's. I left the pursuit of this and sold everything in 2000. I'm now back and starting over. A guy on e-bay had this mirror for sale and I made an offer of $200 bucks and he took it. The mirror arrived last week and it is brand new, perfect coating. The guy had it listed as a spherical mirror but his company is an industrial surplus outfit and I know he did not know what he had. I'm of the opinion that this is a parabolic mirror. If I remember faster mirrors were usually parabolic. I don't remember how to test this mirror, or can I find any info on this. It's marked "12 1/2 F6 FL 75 inches". The tag on the rear also states "pyrex first surface mirror". I've built a couple of solid oak (not plywood) dobs that were award winners at Stellafane. My 12 1/2" F6.4 won first place for craftsmanship back in'96. That same year my late partner won first place for optics on his 16" f6 dob. Before I get to it I'd like to know if anyone has any imput on this glass. Happy New Year.
Attached Image:
C-11 Fastar on G-11 Gemini 2
AP130EDF on pier mounted G11
C-8 Fastar
C-6 on SP
GPC-8
Coulter CT-100
C-80 on Polaris
Genesis SDF on Gibralter Sky Tour
Genesis F/5
Oracle on Gibralter Sky Tour
Televue-60
Many Binos
Too many eyepieces to list
Denk II's
SXVR-H9C
Hyperstar 3 11"
Byers Cam-Trac with Polemaster
Televue Solaris Daystar T-Scanner 0.7
on and on and on