On my 7D, the circular image was entirely contained on the sensor, with too much room to spare. It was difficult get proper focus through the view finder, as the image was so small. The frame of the UV filter included with the rental produced a visible ring at the outer edge of the circular image. Great if you are looking to re-create the look of a security peep-hole or periscope... I returned it early, as it was not what I expected. I felt like too many of my sensor pixels were unused and wasted.
Sigma 4.5mm f/2.8 EX DC HSM Fisheye for Canon
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Note: This lens is only compatible with the 20D, 30D, 40D, 50D, 7D and Digital Rebel series digital cameras. It is not compatible with the 1D or 5D series digital cameras nor 35mm film cameras.
This Item Normally Includes: Front cap and rear cap.
This lens is SPECIALLY DESIGNED FOR CROPPED SENSOR CAMERAS!! On a 7D or full size sensor an 8mm fisheye will give you a circular image. This lens WAS MADE TO SOLVE THE CIRCULAR FISHEYE PROBLEM FOR CROP SENSOR CAMERAS LIKE THE CANON DIGITAL REBEL SERIES, ETC.... So if you use this lens on a full frame camera you will get a lot of black around the circular image. RENT THE 8MM FISHEYE FOR THE 7D CAMERA.