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Message: <blockquote data-quote="elkcub" data-source="post: 3173125" data-attributes="member: 14473">Hi Kimmo,In reviewing who said what on this thread, I came to realize that you had already provided this excellent "elaboration," that's very much worth rereading.  :t:My earlier comments were basically intended to point out that Suiter's book primarily addresses the evaluation and correction of astronomical telescopes, and that his approach is to pictorially show idealized individual aberration effects using MTF graphs and star pattern images.  The computer programs and graphics needed to do this were truly formidable.  (Appendix B, for those with courage.)  Later in the book he does refer to the eye end eyepiece, even for astro. telescope evaluation (Chap. 12, Pg. 232, below).  But, in the end the star tester is faced with evaluating the aggregate pattern, which is a complicated mix of interactive effects (Chapter 15, Pg. 265, below).  That's were human pattern recognition/interpretation enters the picture.  :eek!:Ed</blockquote>