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I have followed this thread with some interest and I am glad it has remained civil.
It seems from the discussion that there is no "single" consistent measure currently taken that can be compared across a variety of manufacturers. Due to differences in testing and testing equipment direct comparison can be difficult.
I'll ask a slightly different set of questions that I think is still in line with the thread...
Can you have a bad mirror with a .99 strehl (or .95 or .96 etc. etc.)?
Is it reasonable to assume that anyone that could/would create a mirror with such a high strehl mirror would automatically check for these other defects that would cause such a high strehl mirror to be "bad"?
Just looking for some helpful guidelines/rules of thumb on this as I now beleive that this may have been the original intent of the first post...and I do recognize that this may be a situation where "if you have to ask, you aren't experienced enough to see the difference"...
I stand by the implication in my earlier post that not everyone "needs" (desires/deserves/can afford) ultra premium gear but that should not disqualify them from enjoying 97.8734% of the things to see in the hobby. Like an automobile, sometimes a Kia is sufficient...
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