Technologically advanced camera systems with a high pixel density drive the SP series lenses to perform at their best. Superior optical performance is a standard and enhanced by improvements in functionality, handling, and external design. The SP 45mm F/1.8 DI VC USD is a 45mm lens capable of remarkable resolving power and sharp images. While the integration of VC into a fast standard prime lens for full frame DSLR cameras is an industry first. This lens delivers crisp and tack sharp images at any setting from 1.8 full open and Fluorine coatings provide excellent light transmission and protection while a round 9 blade aperture assure excellent image quality. Quick focusing is provided utilizing Tamron's USD (Ultra Silent Drive) and with a MOD (Minimum Focus Distance) of 11.4', this lens is quick and capable for all situations.