This lens is a single focal length telephoto lens equivalent to a 150mm lens for 35mm cameras, optimised for studio, stage and indoor sports photography as well as portrait shooting. Thanks to the rational lens design, it delivers sharp, clear imaging capture with a fully open large aperture of F1.8. To ensure clear image capture even under unfavourable conditions (such as when shooting against the light) the lens surfaces are coated with ZERO coating. This minimises issues with ghosts and flares. The MSC mechanism provides a quick and silent focus mechanism for movie and still image shooting.