This Tak adapter allows mounting of a Nikon 35 mm camera without vignetting which occurs if a normal t-ring is used. You will need a Nikon t-ring to mount your camera. The t-ring is disassembled and the camera mount half is attached to this adapter, which in turn attaches to the Tak 35mm adapter for your scope. As the photo shows, a few wear marks but this ring is fully functional.
Yours for $18.00 which includes shipping in US.