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Message: <blockquote data-quote="elkcub" data-source="post: 1704600" data-attributes="member: 14473">Dear Oleaf, Let me give it one more try.  Here is the abstract from Holger Merlitz' paper published by the Optical Society of America.  If you find any reference to field curvature, either here or in the main article, please point it out.  The title is "Distortion of binoculars revisited: Does the sweet spot exist?"  (The "sweet spot," incidentally, is not what most people refer to by that term, but rather a narrow range for an optimizing parameter.)    If after reading this you believe that panning with a wide-angle SLR produces the same globe illusion, particularly because its corrected for field curvature, that is entirely up to you.  Forgive me, but I find it amusing that you also think I've got "some things mixed up."  Your statement: appears to be the basis for an insightful publication all of its own.  Cheers,Ed</blockquote>