F-Mount Lens / FX Format, Aperture Range: f/2.8 to f/22, All-Metal Construction, Manual Focus, 6" Minimum Focus Distance, 7 Elements in 6 Groups The 28mm f/2.8 Color-Skopar SLIIs Lens for Nikon from Voigtlander is a fully mechanical 28mm prime lens with a maximum aperture of f/2.8. It features 7 optical elements arranged in 6 groups using double sided aspherical lenses which ensure the image retains sharpness all the way to the corners and allow the lens to focus at an very short distance of just 6 inches. The smooth manual focus operation also contributes to controlling focus position and both depth of field and focus distance scales are featured on the metal lens barrel to aid in pre-focusing or setting hyperfocal distance. This lens' physical design also features a scalloped focus ring to recall classic lens designs of the 1960s as well as afford more secure handling during use. Mixing the classic-inspired design with contemporary usage the lens also sports an Ai-S-type CPU to permit in-camera adjustment of the aperture setting for faster more intuitive exposure control.