Opteka 6.5mm f/3.5 Manual Focus Aspherical Fisheye Lens for Sony Alpha A99, A77, A65, A58, A57, A55, A37, A35, A33, A900, A700, A580, A560, A550, A390, A380, A330 and A290 Digital SLR Cameras Conforms to APS-C (1:1.5x) size digital imaging format Actualizes a 6.5mm focal length and a diagonal angle of view of 180 degrees for APS-C size When fully opened, it produces both high resolution and high contrast at the center of the lens, as well as around the periphery of the lens Removable bayonet petal type hood and super multi-layer coating help control flaring and ghosting Offers robust durability by incorporating a rigid aluminum base frame