Asahi Pentax Super-Takumar 55mm f/1.8 lens, M42 mount. Includes a 49mm filter and lens cap. The aperture ring functions, but it's stiff. I mainly used it wide open. Everything in the photos is included. Please understand that this is a used item. - Brand: Asahi Pentax - Model Name: Super-Takumar 55mm f/1.8 - Filter Diameter: 49mm - Accessories: Lens cap, skylight filter Thank you for looking.