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Message: <blockquote data-quote="Bob Blaylock" data-source="post: 208638" data-attributes="member: 16749">I assume this is a lens that you previously used on a 35mm film camera?  If so, then know that because the sensor in your D5100 is smaller than a standard 35mm frame, you will get higher magnification with this lens on your D5100 than you got with it on a 35mm.  Every reference I have seen makes the factor between FX (full 35mm-sized frame) and DX (what you have in your D5100) to be 1.5, though my own math comes up with a number closer to 1.55.  Going with the 1.5 factor, just because it produces easier numbers, your 200mm lens, mounted on your DX-format camera, will produce the same magnification that a 300mm lens would have produced on your old 35mm camera.  If you found the magnification disappointing on a 35mm camera, you might find it's just right on your D5100.</blockquote>