This is a primary mirror originally made for a B&L
Criterion 6" SCT. Bought at Stellafane 2 years ago.
High quality optic. FL 11.5". Center thickness 15mm,
tapering to 8mm at edge for quick cooling. Central hole
1.5". Unused, aluminized, EC. Do not have a wave rating
but looks like a good sphere with my Foucault tester. It
would make a good Schmidt camera or could be reworked
if you want. Pyrex. $5 discount if you use Paypal instant
fund transfer. Can't take credit card. All reasonable offers
considered. US addresses only. $5 shipping.