The Pentax SMC DA f/4.0 to 5.6 ED WR Lens Pentax is suitable for DA series lenses with APS-C sensor format. It offers a focal length of 75 mm to 300 mm. This lens system makes use of a quick-shift Focus System that achieves manual focus in an instant in a quiet and efficient manner. Plus, it offers maximum magnification ratio of 1:4.