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One way to answer this is what is the mirror accuracy of these GSO RCs?
I doubt its even 1/4 wave but it must be fairly close. There plenty of sensational images using them.
I imagine (I don't know for a fact) that a computer controlled polishing machine can most likely take a mirror close to 1/4 wave without too much trouble but to get it further requires more expensive, more precise machines and probably a fair bit of human labour and work to get that last little errors smoothed out.
Greg.
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