Both the mirror on the Oberwerk mount and the new replacement are the same 1/2 inch thick first surface mirrors , a coating system chosen for optical purposes. As to the optical flatness I could not say and have no way of testing. I think that it is more than capable for visual use and looks equal to my diagonal.
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Originally Posted by FI93
For a mirror mount you need a First Surface Mirror, army tank mirrors are first surface mirrors, but would not be optically flat (very expensive those).
My DIY mirror mount can be used with good results up to my 28x100 binoculars using a good first surface mirror ( from the supplier down Bankstown way Sydney.)
The office man there will look p a nice piece as his daughter is a budding star gazer.
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