2/3" 50mm F/2.8 w/LockIris: ManualMount: C1/3" Angle of View (wide/telephoto) 5.5° x 4.1 ° 1/2" Angle of View (wide/telephoto) 7.3° x 5.5 ° 2/3" Angle of View (wide/telephoto) 10.1°x 7.6 ° Effective Diameter (Front/Rear Lens) Ø18.5mm/Ø14.9mm Minimum Object Distance 0.20m Back Focus 34.46mm (in air) Filter Size M30.5 P=0.5 Maximum Diameter ø34mm Overall Length 77.5mm Weight 117g