Camera Adapter for Mamiya 645 lens to Sony Alpha MA 900 700 Sony A900, A850, A700 Sony A580, A500, A450, A390, A380, A350, A330, A300 Sony A290, A230, A200, A100 Sony A55, A35, A33 Minolta Dynax 7D, 5D etc. This adapter is with Precise Design, Better Fitting and and more smooth operation! It allows you to use Mamiya Lens on Sony cameras. Precisely Design, Superb Quality Allow focus to Infinity. It has no glass element so no effect to optical performance.