Features: 1.8mm 170° wide angle board lense for CCTV cameras has standard M12x0.5 thread, suitable for both 1/3" and 1/4" CCD chipsets, with an aperture of F2.0. Standard M12x0.5 thread Image format for both 1/3" and 1/4" CCD Specifications: Angle of View: 170° Focal Length: 1.8mm Back Focal Length: 5.44mm Format: 1/3", 1/4" Mount thread : 12x 0.5 Packing list: 1x 1.8mm wide angle Lens for IR CCTV Camera