I've no idea why - RMS is a better indicator of quality than raw P-V and there is an approximate formula relationship between RMS P/V and Strehl .
Quote:
Originally Posted by LewisM
Mark, correct me if I am mistaken, but for the very reasons you highlight is why mirrors tests are usually reported with wave fractions, whereas lenses typically will report with Strehl (taking into account a MEDIAN Strehl based on the summation of individual factor Strehl ratios).
It's not often we see lenses shown with say 1/8 wave (though you CAN find it), whereas most top mirror makers will report their mirror results in wave.
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