25mm F/1.6Iris: ManualMount: C1/3" Angle of View 11.0° x 8.2° 1/2" Angle of View 14.6° x 11.0° 2/3" Angle of View 20.0°x 15.0° Effective Diameter (Front/Rear Lens) Ø16.0mm/Ø10.8mm Minimum Object Distance 8.3 in. (0.21m) Back Focus 11.60mm (in air) Filter Size M25.5 P=0.5 Maximum Diameter ø1.1 in. (ø29mm) Overall Length 1.0 in. (25.5mm) Weight 1.3 oz. (37 grams)