This is a Minolta MD 50mm F/1.2 manual focus prime lens with a maximum aperture of f/1:2. It is compatible with Minolta cameras and has a Minolta MD mount. The lens is made of metal and has a compatible lens front and filter size of 49mm. It is a standard prime lens with a focus type of manual. The seriel number is #1423575 and it was made in Japan.