I have no knowledge of this type of lens, but I just received a few of them. This is an OptiVision anamorphic lens. The bottom measures 46mm. There is an attachment that fits on the bottom that says 150mm on it. This has a base of 23mm. I believe it is a C mount. There are no blades on this. I see no way to focus this as nothing on the lens barrel turns. If anyone knows what this fits please let me know.  It is heavy for its size.