The NOKTON Classic 40mm F1.4 is a high-performance single-focus lens with an aperture range of F1.4 to F16. - Model Name: NOKTON Classic 40mm F1.4 SC VM Mount - Aperture: F1.4 - F16 - Lens Configuration: Single-focus lens I purchased this lens used from a camera shop and have only used it once or twice. *The size selection on the Mercari system is "Nikon F," but it is actually a VM mount.