The Canon EF 8-15mm f/4L Fisheye USM is a unique zoom lens offering circular and full-frame fisheye effects, known for its high image quality and versatility. It is ideal for creative photography, including landscapes, architecture, and experimental shots. For video production, this lens provides unique fisheye perspectives, making it suitable for special effects and creative filmmaking. It is compatible with Canon EF mount cameras and works with both full-frame and APS-C sensors. When used on APS-C cameras, the lens will have an effective focal length of approximately 12.8-24mm due to the crop factor.