Rare TV Tamron super-wide with C-mount. Clean internally above average will give optimal performance. No focusing by default but i've noticed one can easily use lens C-mount holder for focussing. It really works. I don't mean the mount but mount inner connection with lens. It has plenty of helicoid movement and it is smooth. Since rear goes deep one must be careful not to touch sensor. Image size coverage is close to 1" with some vignette.