Tele-Xenar lens made by Schneider-Kreuznach, a high-quality prime lens with an aperture of f/3.8. Aperture and helicoid are in good working order. The lens has some dust, but it's clear considering its age. It comes with the original box and has been stored for many years. There aren't many scratches on the mount, so I don't think it was used much. - Brand: Schneider-Kreuznach - Model Name: Robot - Model Name: Tele-Xenar - Aperture: f/3.8 - Lens Diameter: 75mm Thank you for looking.