Quote:
Originally Posted by Shiraz
three points should do the job.
For an imaging system (not for visual though), with a 10 inch mirror you really don't need to be too concerned with slight distortion of the optics - you will rarely get better than 2 arcsec FWHM seeing and even slightly imperfect optics can do much better than that (eg 1/3 wave optics is going to be indistinguishable from perfect optics most of the time).
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What Ray is saying is essentially correct. In the interests of completeness, however, it should also be pointed out that in a typical imaging rig the ccd under samples the focal plane to a large extent. You would need to be operating at something like f/24 and have perfect seeing before >1/4 wave optics became a major concern whilst imaging.
best,
c