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Message: <blockquote data-quote="ronh" data-source="post: 1279774" data-attributes="member: 55514">Just a whimper as I go down for a final time...Ron,I took 40 line pairs per mm to mean the resolution in the focal plane, suggesting a real image that then requires an eyepiece to convert to visibility. I believe this is consistent with Henry's remark that the objective is a vital part of the system, and for me to speculate very deeply without knowing its MTF is futile.Henry,You have actually cleared it up for me, as you see from the above. The basic MTF we see is that of the objective, and it is perturbations in that that are the aim of the paper's study of the effects of prism.Kevin, Thanks again for the original link, and the boatload of others, which I intend to read at least part of.Does one realization, amid mid many more unanswered questions, count as learning? You bet! Just, sort of nonlinear is all. Thanks guys, I am proud to have met such an experienced and pretentious bunch!Glub...</blockquote>