The Bower 500mm f/8 Preset Lens is a lightweight, compact lens, designed to makes it the perfect long range lens for sports, wildlife and other telephoto photography applications. The computer-designed multi-coating allows flare-free photographs under extreme lighting conditions, resulting in high contrast and better color. Lens has a fixed aperture of f/8 and an optional matched 2x extender will boost magnification to 1000mm with no loss of optical quality.