16mm F/1.4Iris: ManualMount: C1/3" Angle of View 16.9° x 12.7° 1/2" Angle of View 22.5° x 16.9° 2/3" Angle of View 30.9°x 23.2° Effective Diameter (Front/Rear Lens) Ø11.5mm/Ø11.5mm Minimum Object Distance 11.4 in. (0.29m) Back Focus 11.85mm (in air) Filter Size M25.5 P=0.5 Maximum Diameter ø1.2 in. (ø30mm) Overall Length 1.0 in. (25mm) Weight 1.8 oz. (50grams)