Extends focal length by 2x Resistant to moisture and dust Please check compatibility prior to purchasing; Canon Compatibility List The Canon EF mount has been in use since the first EOS camera was launched in 1987, and has since been joined by the EF-S lens type for specifically designed for APS-C sensor digital SLRs. Canon lenses are available in zoom, and prime categories, featuring technology such as the quick, quiet Ultrasonic autofocus motor, movement-detecting Image Stabilization and robust water and dust proof L series construction. Photographic genres such as landscape, macro and sports photography, among many others, are well catered for, with professional and beginner level Canon lenses available for each discipline. Canon prime telephoto lenses in particular are well respected amongst sports and news journalists, often featuring at major sporting events around the world.