Canon EF 8-15mm f/4 L Fisheye USM

Full-frame fisheye zoom producing a 180° circular image at 8mm and a 180° diagonal fisheye at 15mm. Features 14 elements in 11 groups with UD glass for reduced chromatic aberration, Subwavelength Coating for minimized ghosting, and fluorine coating. Ring-type USM autofocus with full-time manual override. Constant f/4 aperture. L-series weather-sealed construction.