BiG DIGITAL 0.21x Super Wide Angle Fisheye Conversion Lens for The Sony Alpha Series SLT-A33, SLT-A35, SLT-A37, SLT-A55, A57, SLT-A57, SLT-A57M, SLT-A57K, A58, SLT-A58, SLT-A58K, A65, SLT-A65V, SLT-A65VL, A77, SLT-A77, A77II, A99, SLT-A99V, A100, A200, A230, A290, A300, A330, A350, A380, A390, A450, A500, A560, A550, A580, A700, A850, A900 Digital SLR Cameras NOTE: This Conversion Lens is compatible with 58MM, 55MM, 52MM, 46MM, 43MM, Lenses. Your camera's lens thread size will be marked somewhere on the lens barrel or printed underneath your lens cap. This number is always preceded by an "" (diameter) symbol. It screws nicely on the end of your lens and, bingo; you have a fish eye lens. The lens can be used for a variety of creative visual effects. The 180 angle of view means that the entire environment directly in front of the camera is recorded. The lens' multi-coated glass helps reduce flare, while preventing chromatic aberrations. Construction, Elements/Groups3 elements/ 3 groups (fully multi-coated)