I'm stumped. This has to be an auxillary lens, right? It seems to be factory made. Has anyone ever seen anything like it? Even a good guess would help. Thanks .
Looking at the images with a phone. But it looks as if it is the remainder of a lens that has been raided for parts for another lens. Or someone has done a DIY job on it for a totally different system. Gary
Gary is correct, someone has taken it apart and you are left with the remnants. Here's three views of mine (excuse the dust and crappy phone photos)