This is a cool (and relatively fast) telelphoto mirror lens. I am not sure what the mount is, it seems to be a universal mount that would require another attachment to mount to a camera. The threading is ~50mm.

It is in excellent condition with light wear and works perfectly. The glass is clean and scratch-free with no haze, fungus, nor other issues.

A front cap is included.

SKU: 250222-14