This is a used PENTAX SMC Pentax-M 1:1.2 50mm Asahi lens. It has a maximum aperture of f/1.2, a bayonet mount, and an exterior made of aluminum. The lens is manual focus and compatible with Pentax cameras. It has a focal length of 50mm and belongs to the Pentax SMC series. Beautiful lens, brilliant in low light and lovely Bokeh. The optics are absolutely perfect. The metal filter ring has a dent in it (shown in photos). I’ve loved using this lens, it’s so good for portraits.
eBay