Quote:
Originally Posted by joshman
my understanding is that the critical focus zone is a function of the physical parameters of the scope, and nothing to do with the manufacturers quality.......
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Disagree. Dick Suiter's book on star testing 'scope optics ponders this at length. Excellent optics "snap" into focus.
Those with SA or some other fault never really reach focus...they sort of endlessly mush through it.
Thats said, sure, faster optics have tighter zones and are more sensitive to focal plane tilt etc., but it's often the case that a whole lot more needs to be on the money first.