Product Name : CCTV Lens;Image Format : 1/3;Mount : 12 x 0.5mm Focus Length : 2.8mm;Back Focus Length : 4.4mm Aperture : F2.0;Angle of View : 120 Degree Size : 14 x 16.88mm(D x H) Weight : 20g; Super-Wide Angle Lens: The 2.8 mm Board Lens provides an extra-wide field of view, which is ideally suited for most installations. A 6mm lens will bring you closer to the action than a wide angle lens, and when used with an IR Camera, it will not cause glare from the IR light, as a wide angle lens will. All IR Camera manufacturers recommend using a 2.8mm Standard Board Lens or higher for use with their IR Cameras. Easy to Install: Replacement lens easily threads in after removal of the previous lens is removed. Material: ABS, glass Package Content : 4 x 2.8mm CCTV Lens Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.