Standard zoom lens series pentax da lens mount pentax k lens speed 35 focal length 16 85 mm suitable for sensor type aps c construction zoom lens area of use landscape photography focus auto focus manual focus af motor ultrasonic motor usm circular aperture max magnification 13 85 closest focusing distance 35 cm focal length equivalent to 35mm camera 24 127 5 mm lens types aspherical ed lens construction groupselements 1216 number of a