The Vivitar 28-85mm f/2.8-3.8 is a manual focus wide-angle zoom lens with sharp and vivid images. This version of Vivitar 28-85mm lens is designed for Nikon F mount cameras. The lens features Auto Indexing ridge which meter couples when mounted to Nikon F cameras. The integrated prongs have cut-outs to help illuminate the f/stop markings for ADR. The lens has 14 elements in 11 groups optical construction, six iris blades, 10.2 inches close focusing distance and 67mm filter thread.