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Originally Posted by janoskiss
Well, Andrews' website lists them all as 1/12, but you don't really know till you check for yourself. Sorry, I don't have an interferometer handy atm.
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Thats correct. They are rated at 1/12th wave surface accuracy but that equates to only 1/6th wave at the wavefront, or a strehl of about .92 which is a very good mirror BTW, and way better than diffraction limited. I have heard of some that have tested as high as .97 strehl with interferometer testing.
CS-John B