I have an old Sony (but made by Canon) C-Mount lens. It is a 17 to 102 mm 1:2.1 slide zoom/focus. It also has an integral iris with a range of 2.1 to closed. It was used on a Sony color TV camera and has a white opalescent lens cover for white balancing. The lens diameter is 58mm and has a standard filter thread. C-Mount adapters are available for some DSLR and mirrorless cameras.
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