My second attempt at buying a C-Mount adapter worked out, and got a chance to try some quick photo's with this lens. It is a Kowa 12.5mm F1.4 made for 1" C-Mount cameras. Vignetting, but no worse than a lot of Fish-Eye lenses. It is fast, and will meet my need for a small, fast wide-angle lens. Close-up and wide-open at F1.4: Distance shot, also wide-open: Another close-up and wide-open, show off the swirly Bokeh. C-Mount lenses such as this used to be very cheap. Get them while you can!