The Vivitar 19mm f/3.8 is a compact and lightweight manual focus wide-angle lens. Built to Vivitar's high standards offering a f/3.8 maximum aperture, rectilinear images (straight lines remain straight) and maintains image quality. This lens is capable of focusing down to 8" (20cm) for dramatic perspectives. The lens also employs a Prong that will meter couple to the older 35mm manual focus SLR cameras. This version of the Vivitar 19mm is built for Nikon F mount/AI-S cameras.