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ATM How to test a Gregorian secondary mirror


Hi,
This is my first time to ask question here.
I'm an amateur telescope maker from Hong Kong.
I'm going to make a small Gregorian telescope, but I
can't find any information about how to test the
secondary mirror. Can anybody tell me how to test it
by using a Foucault test/Rochi test?
Thank you!

=====
Wah!

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