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I forgot to mention, that as the aperture gets bigger, the central peak gets bigger in relation to the other peaks. The central obstruction in most common SC's and RC's puts more intensity into the secondary and tertiary diffraction rings and so on. That is why the refractor officionados are so so vehement about their chosen optic.They just simply ignore chromatic aberration.
There is no perfect optic. You use the best one for the job.
My 300mm lens cannot resolve what your 2500mm RC can. Your 2500mm cannot show as wide a field as my 300mm lens. We all take our pick.
That is why there is no point argueing. Make the best of what you have and push it to the limits.
Scott is doing just that.
Bert
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