Pentax 70mm f/2.4 DA Limited Lens for Pentax and Samsung Digital SLR Cameras Ultra-thin, super lightweight design, Minimum Aperture: f/22 Focal length equivalent to 105mm in the 35mm format with ist & K-series DSLRs High-grade aluminum construction in the lens barrel, hood, and cap, SP coating helps protect the lens against dust, water, and grease Quick-shift Focus System for instant AF to MF switching eveloped specifically for Pentax digital SLR's, with an image circle perfectly proportioned for a digital sensor