On full frame cameras, such as the EOS 5D Mark II or the EOS-1Ds Mark III, the lens works as both a circular fisheye, where a circular image is projected back to the sensor, and a full frame fisheye where the scene fills the entire sensor.
Click here to watch a short clip showing the zooming effect of the EF8-15mm f/4L Fisheye lens with the full frame EOS 5D Mark II DSLR.
