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Re: ATM optical center
You will have to measure the flatness of the backside and then the wedge of
the glass surfaces in order to tell whether things are right or not.
Unless the back is a good polished flat (a few waves is good enough) and
there is no tilt or wedge from the back to the front surfaces (not measured
with newt. mirrors typically) then you will probably have an offset of the
two images.
Bob May
http://nav.to/bobmay
bobmay@nethere.com
NEW! http://bobmay.astronomy.net