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Mirror, mirror, on the wall, who has the highest Strehl of all?
I would have to argue that it would be a 19.999" something with good optics. Assuming it is appropriately mounted, the sensor samples the image adequately for the focal length, and the system is well designed to eliminate 'problems' ie flex, stray light. I've guessed the CDK style, which is why I'm buying one. Others are opting for RC, and the best will always come from one of the custom optics houses. The fact that there are multiple options still commercially viable means there is no correct answer!
I heard the r-h was ok too, but I'd hate to think what a mangin mirror near 20" would cost.
Cheers,
Andrew.
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