Circular Fisheye Crop Comparison
Circular Fisheye will work on a full frame camera. The image circle will be smaller showing all the barrel flare (right image).
* When using Circular Fisheye on Canon APS-C camera bodies, depending on your focusing distance the top or bottom of the image circle may be slightly cropped and cut off.
Circular Fisheye will work on micro 4/3 sensor cameras, on these cameras the top and bottom of the image will be slightly cut off (shown below).