A cheap brand-less CCTV lens 25 mm f/1.2

This tiny little brand-less CCTV lens can be bought for a few dollars and features a very wide aperture of F/1.2. It mounts on the Sony Nex using a C-mount adapter. Aperture can be controlled by the blue plastic ring, the focus distance by the front metal ring. On the NEX C3 the focal length of 25 mm is not enough to cover the whole APS-C sensor. A full frame can be covered without vignetting from a focal length of 50 mm or more.



By placing a small screwable ring between the lens and adapter it becomes possible to focus at closer distances. The following two pictures are examples of cheap macro photography. The advantage of the ring is that a larger portion of the sensor is being covered.