This useful 2.8-12mm lens with 108 degree to 31.2 degree viewing and IR capability features a 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 adapt the camera to the exact requirements of the chosen application. Focal Length (mm): 2.8 ~ 12mm Format (inch): 1/2.5 inch Aperture (D/f'): 1/1.4 Mount: M12 Horizontal Field of View: 108 degree -31.2 degree Dimension (mm): Diameter 28.6x44.8 Weight: 40g/Pieces D (m): 0.2 Zoom: Manual Focus: Manual Iris: Fixed Back Focus (mm): 6.39 Operating Temperature: -20 ~ + 80 degrees centigrade Package Contents: 2 * M12 2.8-12mm 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 a little different from the real thing. The measurement allowed error is +/- 1-3 cm.