Nikon AF Nikkor 300mm f/4 ED - Nikon F Mount

The AF Nikkor 300mm f/4 ED is a professional-grade telephoto prime for Nikon F-mount SLR cameras. It utilizes a screw-drive autofocus system and features an internal focusing mechanism to maintain physical length during operation. The optical design includes ED glass elements to ensure high contrast and sharpness even at the maximum aperture, while the built-in tripod collar provides stability for long-exposure or static shots. Commonly, the autofocus motor in the camera body can be strained if the lens internal mechanism is stiff; we ensure the focus action is free. The tripod collar should lock securely without slipping. We also check for internal dust or 'peeling' on the internal light-baffling paint, a known issue with older Nikon telephotos that can affect contrast.