2* CCTV Lens: 1* 2.8mm + 1* 1.8mm Product Name : CCTV Lens;Image Format : 1/3;Mount : 12 * 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*H) board 1.8mm 170degree wide angle Lens for CCTV security camera This Board Lenses are designed specifically for use with Surveillance Cameras They were super easy to install,gave you the focal point you needed Super-Wide Angle Lens provides an extra-wide field of view,which is ideally suited for most installations 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 Color:Black Package include: 2* CCTV Lens Only the above package content, other products are not included. Note: Light shooting 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.