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Message: <blockquote data-quote="elkcub" data-source="post: 3352481" data-attributes="member: 14473">Hi David,Thanks for the interesting post.  Occasionally I've experienced some of the contrast effects you mentioned (coins, pebbles, etc.), but I'm not sure I'd call that sharpness.  Frankly, I haven't given it much thought.  As you say, it's not clear how MTF analysis would be informative, particularly if the perception depends on the color mix, illumination, and are influenced by sample variations.   The only similar color-contrast related phenomenon that begs for an explanation in my mind, is the Swift 804ED's ability to reveal subtle color variations and gradations in birds' plumage.  This is quite an amazing experience.  But it may be idiosyncratic or limited to my particular model type (apparently the same one reviewed by Steve Ingraham in the early 90s).   Few others have commented about it. Ed</blockquote>