RE: ATM Advice on Large Spherical Mirror?

[Andy Saulietis <iss@pvtnetworks.net>]

>It is 16-1/2" dia., F-2.5 (40" focal length) with a central perforation
>of approx. 5" dia. The blank is molded of a clear glass, probably Pyrex?
>Does this mirror have any ATM potential, or is it just another
>ant-burner?

The old 16" Celestron S-C had a primary *similar* to this, including the
8 ribs. These were *spherical* with 80% of the correction in
the correcting plate, 20% in the Cass secondary, f11 final ratio.

If not, most likely part of a military low light or IR imaging
system...

If it's a really good sphere, it might serve to test Cass secondaries
with the Hindle test.




Andy Saulietis
ISS Enterprises
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