It's produced by Nikon but it will give you a reasonable idea of what looks like what on any DSLR system really. Even for those who already have a fair idea of what angle of view & magnification different lenses produce it's still a bit of fun. It is also a good way of seeing what happens when you use a lens designed for a cropped sensor camera on a full framed sensor body and vice-versa.
http://imaging.nikon.com/products/imaging/lineup/lens/simulator/index.htm
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