Pentax-F SMC 35-80 AF zoom lens
SMC Pentax-F 35-80mm f/4-5.6 features 7 elements, 6 groups, 6 blades Optical Construction; Weight 185 g, Length 5.8 cm, Filter Diameter 49 mm; Max. Aperture f/4-5.6; Min. Aperture f/22-32 (from http://www.pentaxforums.com/lensreviews/SMC-Pentax-F-35-80mm-F4-5.6-Zoom-Lens.html).
