Opteka T-Mount (T2) Adapter for Sony A-Mount Alpha A99, A77, A68, A65, A58, A57, A55, A37, A35, A33, A900, A850, A700, A580, A560, A550, A500, A390, A350, A230, A200, A100 Digital SLR Cameras High quality anodized aluminum construction Smooth mounting surfaces allow for effortless attaching Infinity focus allowed Allows you to mount any T-Mount lens your telescope on your camera body Compatible with t-mount lenses such as 500mm mirror, 500mm preset, 420-800mm and 650-1300mm