Spec :

Angle Of View                          :31.5° (w/ PENTAX DSLR)
Number Of Diaphragm Blades   :52mm
Minimum Focusing Distance       :1.48’ (0.45m)
Maximum Magnification             :0.15X
Weight                                     :4.3 oz (122g)
Objective Cap                          : O-LC52N
Lens Aperture Ring                   : 7
Diaphragm Control                   :Fully Automatic
Lens Construction                     : 6 elements in 5 groups
Aperture                                  :f/1.8
Minimum Aperture                    :f/22
Filter Diameter                         :52mm
Dimensions                             :2.5 x 1.5” (63.0 x 38.5mm)
Focal Length                            :50mm (equiv 76.5mm)