Excellent optical design to that the residual aberration can be well reduced, the overall transmission rate increased significantly, the use of broadband multi-layer coating, to maximize the tail and flash the backlight suppression occurs Phenomenon, but also can effectively reduce the reflective loss of the lens, eliminating the better ghosting, glare, spot; coating is very uniform, effectively improve the color reproduction, in order to improve the clarity of the image. VR all series of network HD can be installed -Length(mm): 2.8~12mm Format(Inch): 1/2.5 inch Aperture(D/f'): 1/1.4 D(m): 0.2 Zoom: Manual Focus: Manual Iris: Fixed Back -Length(mm): 6.39 Operating Temperature: -20~+80degree centigrade Length: 1.8MM Angle of View: 180 degree Image Format: 1/2.5 Aperture: F2.0 Mount: M12 *0.5 & M12 Colour: Black material: metal Size about: 20 * 19mm & 28.6x44.8mm Package Contents: 1 * M12 2.8-12mm lens 1 * 5MP-1.8MM Lens Only the above package content, other products are not included. Note: Light 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. 2 Pcs Lens: 1 Pcs M12 2.8-12mm lens & 1 Pcs 5MP-1.8MM Lens This useful, 2.8-12mm lens, with a wide 108 Degree -31.2 Degree viewing and IR capability has a standard M12x0.5 Thread with an aperture of F1:1.4 and is suitable for 1/3 inch CCD chipsets and 1/2.5 inch IP camera. The manual focus lens can be used to tailor the camera to the exact requirements of the chosen application Real HD Lens