The Canon EF 85mm F1.4L IS USM lens is a professional grade L-series prime telephoto lens designed for Canon EF mount DSLR cameras. It features a fast f/1.4 aperture for excellent low light performance and shallow depth of field, Image Stabilization IS to minimize camera shake, and an Ultrasonic Motor USM for quick and quiet autofocus. This kit includes a Hoya UX UV 77mm Filter, which protects the front element of the lens from dust, scratches, and impacts, while also reducing atmospheric haze caused by ultraviolet light. The filter is specifically sized for lenses with a 77mm filter thread.