eBay
 Vivitar 400mm F6.3 for the Nikon F mount. This lens was made for Vivitar by Tokina (37 start on the serial # ) It is a great and clean working telephoto. It is fully manual focus and aperture lens. It has excellent glass no fungus, and takes sharp pictures. It has a built in metal extending lenshade and locking rotating tripod mount. The lens is overall in excellent condition and the focus is smooth and the aperture is springy and quick. I shot the photo of the red car covered with road salt hand held-this lens has no problem resolving the letters on the tire!
This is a great budget telephoto and I stand behind my sales with a 7 day return policy. Lens comes with front and back caps-front generic the rear is a Nikon cap.
Thanks for looking and please email with any questions.

 Thanks,
   IO