A professional prime lens with a large maximum aperture for high-performance in low light Excellent background blur thanks to 8-bladed circular aperture Reduce flare and ghosting with Super Spectra coatings A ring-type Ultra Sonic Motor (USM) drives autofocus quickly and quietly Part of the Canon professional L-Series flagship range, its designed for robust handling and resistant to dust and moisture Distance information is passed back to a compatible EOS camera's E-TTL II flash system to ensure optimal flash metering Compatible with all Canon DSLR cameras and EOS-M mirrorless cameras with an EF-EOS M Mount adapter This professional L-Series prime lens is an ideal general-purpose solution for the professionals kit bag. With a large maximum aperture of f/1.2 its fast when shooting in low light, with excellent control over focusing for shallow depth of field and creative effects when on location. For a truly professional finish, the ring-type Ultra Sonic Motor (USM) drives fast and quie