Computar varifocal manual iris lenses offer maximum flexibility in camera installations requiring a wide range of focal lengths. Focal length adjustments can be made with a turn of the dial, virtually eliminating the cost and inventory problems associated with improper monofocal lens selection. All lenses are CS-Mount, comprised of all glass optics, come with locking setscrews and a durable metal barrel and mount, and are covered by a three year warranty.