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The 35mm and 75mm models are useless, they will only give you a small illuminated circle because they aren't made to cover a 1" sensor. The 12.5mm will also vignette (you'll get about a 16mm equivalent after cropping a rectangle) and none of them may work owing to the mounting back not fitting into c-mount adapters available. The motorized units won't work at all as they are controlled via cables to the CCTV camera. Their aperture's normal resting state is fully closed. Lastly, why pay B&H $300/ea for generic (don't know who makes them) lenses when they can be had surplus for $20-$50?
Fujinon, Pentax (Cosmicar, Computar), Schneider, Angenieux, Sony, and a host of European lenses like Som Berthiot and Kern Switar (Kodak as well) used for 16mm that are c-mount. Generally, the lenses used for 16mm film cameras do a better job of coverage and will mount into current micro 4/3rds adapters without modification. The Cosmicar 12.5mm (Pentax) 12.5mm f1.4 (for example) needs some minor machining done to its rear cell to make it focus at infinity.okay cool thanks I am just starting to check out this area , any recommendations as to brand?
B&H website is wrong about the coverage of these lenses, as the CF***HA-1 lenses are designed to cover a 1" sensor, which is a bit smaller (9.6 x 12.8 mm) than Micro-4/3rds format (13.5 x 18 mm). I have never tried these lenses but guess the 12.5/1.4 and 16/1.4 will not cover Micro-4/3rds (circular image), while the 25/1.4 will exhibit a bit of vignetting (I think it's the newer version of the lens described in this thread) and the longer focal lengths (35/1.4, 50/1.8 and 75/1.8) will cover the whole frame.