Nikkor-H 300mm f/4.5 Non-AI is a manual focus telephoto prime lens. The optical construction of six elements in five groups, six blade diaphragm, 13ft 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, built-in lockable 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.