The Vivitar Series 1 35-85mm f/2.8 is normal, fast zoom lens with superior optics. Series 1 optics enhances contrast and resolution from edge-to-edge throughout the entire zoom range with minimal dispersion optics. Its VMC multi-coating maintains its sharpness and contrast throughout its range. Series 1 35-85mm employs 12 elements in 9 groups, 6 aperture blades, 10 inch close focusing distance and 72mm filter thread. The lens also features a Prong that will meter couple to older Nikon 35mm manual focus SLRs.