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Re: [ATM] refiguring a 20 inch Pyrex f/2 cassegrain
The F2 will be a problem with testing as the Foucault test will
be very poor for that. Time to either try a null test or the
Caustic test. I will note that size doesn't matter here so much
as the focal ratio.
As to figruing, that is going to be more of a matter of doing a
little and then testing the mirror for changes. Orienting the
mirror in the stand and having good contacts on the backside to
locate the mirror will make setup of the testing a lot easier.
Bob May
bobmay@nethere.com
http://nav.to/bobmay
http://bobmay.astronomy.net
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