“Canon has announced the EF 8-15mm f/4 L USM, the world’s first fisheye zoom lens to offer both ‘circular’ and ‘full frame’ images. This replacement for the EF 15mm F2.8 fisheye will produce circular images with a 180 degree angle of view when used at its widest setting on 35mm-format cameras such as the EOS 5D Mark II, and images which cover the full sensor area at 15mm.”
– via dpreview