The PENTAX 85mm F2.8 SOFT lens, with a 52mm filter thread, is characterized by its soft rendering. - Brand: PENTAX - Model: 85mm F2.8 SOFT - Filter Diameter: 52mm - Aperture: F2.8 - Focal Length: 85mm I have confirmed that it works when attached to a camera. Autofocus and aperture appear to be functioning correctly. Please note that the lens has overall mold, but it doesn't show up well in the photos. There is also some slight rust on the mount side. The filter is a free gift. Please understand that this is a used item before purchasing.