500mm f/6.3 Manual Focus Telephoto Mirror Lens For Sony Alpha SLT, A33, A35, A37, A55, A57, A57M, A57K, A58, A58, A58K, A65, A65V, A65VL, A77, A77, A77II, A99, A99V, A850, A900 Digital SLR Cameras The 500mm f/6.3 Manual Focus Lens is a catadioptric mirror T-mount lens, precision manufactured in South Korea. Super Spectra lens coatings provide even light transmission and minimize flaring Ultra-telephoto range in a compact, lightweight form with advanced reflex design White lens barrel helps prevent heat retention. 7 Elements in 6 Groups. -- Aperture is fixed at f/6.3. -- Focuses to 6.1' (1.86 m)