Ok I've got a 5d mark 2 (full frame sensor) and a 7d (cropped sensor). Would it be better to use the 5d with full frame and a17-40 or 15 mm fisheye, OR use the tokinab10-17 fisheye on the cropped sensor 7d? I've just heard so many good things about the tokens lens that it might be the way to go.
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Wide Angle Dilema
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It really depends on what you are shooting. The tokina is nice but not so great if you want a rectilinear look. 17-40 is very good but sometimes isn't wide enough.
I personally like the Sigma 8-16 on the Canon crops. Awesome rectilinear lens that does better than it's bigger FF brother 12-24, which is soft on FF cameras.
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Matt, Take a look at Udo's pictures comparing the Tokina fisheye zoom to cropped images taken with the Sigma 15mm f2.8 on a full frame sensor camera and then cropped to provide the same overall picture. They are on page 3 of the D800 review. They give you some pretty clear evidence on which to make your choice.
Fred
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Mark, I have the same set up as you. That is the 5D mk II and the 17-40mm as well as the fish eye. I find that the corner sharpness is much better the 15mm. The fish eye allows you as well to focus a lot closer to your subject, but I find the focus noticeably slower than on the 17-40mm.
I don't have any experience with the Tokina...
Below are a couple of photos where you can see the corner blur of the 17-40mm (the photo above) and then a picture taken on a second dive with the 15mm showing more sharpness.
