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You know for most of the time when your seeing is pretty average then I think the wisdom that has been told is spot on, but even here in Perth I can see where my mirror lacks in clarity.
On crystal clear, still winter nights my mirror isn't far off atmospherics. 0.89 arc sec per pixel.
My train of thought is the errors of the PV across the mirror don't "Hide" under the seeing and to some effect are additive, think of it this way if your Mirror was 100% flat, no peaks or vallys (extreme case) then the atmospherics would 100% be the cause of all errors, but if your adding in the light that comes though the aperature is already distorted then it hits the side of peak/vally it will not come back dead straight so its added to the error.
Why would you buy a RCOS telescope for its mirrors why would you get ION milled RCOS mirrors? when GSO sell the same?
Even looking at Mikes ETA and mine side by side, the Qhy9 has 5.4micron pixels Vs 9 micron pixels. The Arc second per pixel isn't too different. but there is a noticable change in resolution. I put it down to higher quality optics.
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