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Mirror Quaility

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Posted by Robert May on September 30, 2003 21:37:03 UTC

I haven't bought any of the UO mirrors but their other products have all been of high quality.
As to the 1/10th wave rating, I'd believe that when I test it.
1/10th on the surface is 1/5th on the wavefront and if you make that RMS then you really don't mean much. A 1/4th wave accurate on the wavefront is merely diffraction limited according to the old Raliegh test and that just means that the mirror can meet some rather relaxed rules for resolution. If you are discussing RMS then there is a lot more that needs to be involved as a typical 1/4th error on the wavefront could be read as a 1/30th or better wavefront error due to the way that the Root Mean Square calculation is run.
I'd take any mirror of that level of accuracy quoted to a local mirrormaker and have him test it to see what it really is.

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