CCTV Varifocal Auto Iris Lens with F1.6 Aperture and 5-50mm Focal Length Focal length available: 5-50mm Aperture: F1.6 Image format: 1/3-inch Viewing angle: 2W =62 degrees 24-6 degrees 50 Back focal length: 12.526 Mount type: CS (12.526) Size: 64 x 50mm