The Canon FL 50mm f/1.8 lens boasts a bright aperture and high descriptive power. - Brand: Canon - Model Name: FL 50mm f/1.8 - Focal Length: 50mm - Maximum Aperture: f/1.8 - Aperture Blades: 6 - Filter Diameter: 52mm - Mount: FL Mount, FD Mount Thank you for viewing. The exterior shows signs of use. The focus ring is smooth. The aperture ring has a good click feel. There is no oil on the aperture blades. The lens has been cleaned, but there may be some minor dust. There are small scratches and slight haze on the front element. There is also slight haze on the rear element. If you have any questions, I will answer them to the best of my ability. Thank you.