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Originally Posted by Orion
Hi Arthur
The mirror is a home made mirror, it's in the rough grinding stage at the moment and we are experimenting with thin mirrors.
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Beats me that grinding... I bought mine roughly ground to f/4.8 but parabolic. It's away in a few days to have final configuration and alumising/quartz coating. I have a set of steps
Arthur
(if you're interested...
http://myweb.tiscali.co.uk/ambermile/dob.htm )