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Understanding The Ronchi Patern.

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Posted by Greg Tedford on November 16, 2002 22:01:59 UTC

I have just finished an 8" F/8 mirror and made a ronchi tester but can't work out how to polish the parabolic shape into the mirror.

My tester shows perfectly straight lines so i have a good concave mirror but i know i need to have the bands bowing out from the centre.

How do i modify my polishing technique to achieve this?

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