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Message: <blockquote data-quote="Fowl Mouth" data-source="post: 1737245" data-attributes="member: 30266">I think I'm going off topic here, but since I've already started, I might as well give some quick examples.The first image is fairly self explanatory, but I'll add some comments. These are cropped portions of a USD 1 Dollar bill. The scale of the 500mm image was reduced to match the per-pixel scale of the 400mm (403mm) image. That alone should give the 500mm image an advantage since down-sizing always "sharpens" the image. I think the result speaks for itself.As for the Male Cardinal images, these were the two closest direct subject images I could find in my archives to closely demonstrate the effect in real field use. In this particular circumstance the Cardinals are both 100% crops. Aside from importing the original RAW files into Adobe Light Room, and compressing  into JPEG, these are completely unprocessed.</blockquote>