Vivitar 400mm f/5.6 Auto Telephoto Manual Focus Lens for M42 Screw Mount

The Vivitar 400mm f/5.6 Auto Telephoto Lens for M42 screw mount is a manual-focus super-telephoto prime lens designed for 35mm film SLR cameras. It features a 400mm focal length ideal for wildlife, sports, and distant subjects, with an f/5.6 maximum aperture for moderate light-gathering capability. The lens offers precise manual focus control and durable construction, making it suitable for telephoto photography with classic film cameras using the M42 mount.