This is an SMC Takumar 50mm f/1.4 lens. It was mounted on a serviced Pentax SV that I purchased from a specialist shop. I am selling it because I bought a different lens. The aperture blades move smoothly. I have also included sample photos taken with this lens. As a bonus, I will include a UV filter and a lens cap (Olympus). - Brand: SMC Takumar - Model Name: 50mm f/1.4 - Manufacturer: ASAHI OPT. CO. - Lens Condition: Good Thank you for looking.