35mm F/2.1 w/LockIris: ManualMount: C1/3" Angle of View 7.8° x 5.9° 1/2" Angle of View 10.4° x 7.8° 2/3" Angle of View 14.3°x 10.8° Effective Diameter (Front/Rear Lens) Ø16.0mm/Ø10.3mm Minimum Object Distance 11.8in. (0.3m) Back Focus 15.53mm (in air) Filter Size M25.5 P=0.5 Maximum Diameter 1.2in. (30.5mm) Overall Length 1.25 in. (32.0mm) Weight 1.55 oz. (44 grams)