Pentax DA 16-45mm f/4.0 ED AL Autofocus Lens

The DA 16-45mm f/4 ED AL lens is the perfect complement to a digital Pentax SLR camera, providing the popular range of angle of view which is most associated with a standard zoom lens today. Pentax's DA series feature a "Quick-Shift Focus System" which allows an instant switch from autofocus to manual focus with a slight twist of the focus ring. Coupled with simple, functional design, and the elimination of the aperture ring, the camera's operability is significantly improved. The image circle in DA-series lenses is designed to perfectly match the 23.5 x 15.7mm size of the CCD image sensor used in Pentax digital SLRs, and thus will not cover the full frame of a 35mm camera. The design contributes to dramatic size and weight reduction, not to mention production costs