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Old 25-05-2009, 10:39 AM
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mental4astro (Alexander)
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mental4astro is offline
 
Join Date: Jun 2008
Location: sydney, australia
Posts: 5,005
Paul, most professionally made mirrors are machine made on custom made grinding jigs and using various slurries ranging in coursness of grit.

Final figuring is either machine or hand done.

On an f/4, they may have started with a chiesel first though.
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