The Tamron CS-Mount 2.8 to 8mm Varifocal Fixed Manual Iris Lens features a 3MP resolution even in IR mode. Thanks to a special coating and the use of special glass, the result is no focus shift and maximum image quality. With its image circle diameter of 6.8mm, the lens is well-equipped for use with 1/3" sized imagers. The lens features manual focus and zoom which can be locked for convenience.