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I toiled over this, the canon 15mm, or the Sigma 10mm. The nice thing about the Canon is it will work on full frame cameras. This lens will work on a 1D mark III but you have to zoom out to 12 mm to not have a hard boxy looking vignette, it works great on my 40D too. Focus is fast, but you spend most of your time at infinity anyway. When you have AF enabled forget trying to turn the focus ring, it does not budge. It's a sturdy lens too, built like a tank. It feels like the same materials that the L lenses are made of. It is not F/2.8 but fisheyes seem to let more light in anyway. You start at 180' field of view, but it drops as you zoom out, this is probably the only real negative especially when I'm shooting w/ it on my 1D. I typically park the zoom at 14mm regardless of body, and click away. It's fun to put the camera up in someones face (although rude, so dont do to strangers) and take a quick shot, huge nose and huge foreheads :D. I highly recommend this lens if you are in the market for a fisheye.
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