Nikkor 300mm f/4.5 AI-S is a manual focus telephoto prime lens. The optical construction of six elements in five groups, seven blade diaphragm, 12ft close focus distance, 8°10' picture angle and 72mm filter thread. The lens includes a rotatable tripod collar and built-in tripod mounting adapter with a a retractable mental lens hood. The lens is employs a fully automatic aperture diaphragm and a meter-coupling prong. The 300mm is ideal for action, sports and scenic photography.