Nikkor Zoom 85-250 2 inch thread lens mount?
I recently acquired an 8.5cm~25cm Zoom Nikkor with a 2 inch short mount. It came that way from the factory. Lens is not automatic but features a semi-auto diaphragm. I believe it may have been intended for television camera work. Anyone ever see a 51mm (2 inch) mount before? Thanks, WES