Micro-Nikkor 105mm f/2.8 is a top performing micro lens employing Nikon's advanced technology producing exceptionally sharp, rich and clear images. It's optical technology features Nikon's CRC and internal elements which moves around on cams as you focus. The Cams permits consistent control of element position. The lens focusing up to 1:1 life size reproduction with ease. This lens features nine elements in eight groups, 15°20' viewing angle, 0.314 meters close focusing distance and 52mm filter thread.