The 16mm f/2.0 ED AS UMC CS Lens for Pentax K Mount from Bower is a manual focus wide-angle lens compatible with APS-C format DSLR digital cameras. It provides a 79° angle of view which translates into a 35mm format focal length equivalency of 24mm. Its fast maximum aperture of f/2.0 is effective in low light shooting and provides shallow depth of field. With two aspherical lens elements and high index low dispersion glass, chromatic aberrations are minimized and sharp, color-accurate images are the result. Multi-coating on all optical elements facilitates even light transmission and reduces ghosting and flare.