Quote:
Originally Posted by Mark Suchting
The quoted 1/2 wave P-V wavefront ( 1/12wave RMS surface )
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I brought this up in another earlier thread, but didn't have Marks wisdom to draw on ...
1/2 PV isn't very good is it? (ignoring all other factors auch as temp/flex etc). At best that will be ok, but as has already been mentioned - useful for low power only.
I haven't quite got to grips with RMS - I still understand PV better - my mirror making was rather unscientific however!!