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 -Length(mm): 2.8~12mm Format(Inch): 1/2.5 inch Aperture(D/f'): 1/1.4 Mount Standard: M12 Horizontal Field: 108 Degree -31.2 Degree Dimension(mm): Diameter 28.6x44.8 Weight: 160g D(m): 0.2 Zoom: Manual Focus: Manual Iris: Fixed Back -Length(mm): 6.39 Operating Temperature: -20~+80degree centigrade Package Contents: 4 x M12 2.8-12mm 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. 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