Hurry. Surveillance camera lens focal length 2MM 4MM 6MM 12MM
3.6mm 70 degrees 10 meters 4mm 65-68 degrees 10 meters about 6mm 55 degrees 20 meters about 8mm 45-50 degrees 30 meters 12mm 38 degrees 40 meters 16mm30 degrees 50 meters 25mm 21 degrees 60 meters
When the focal length calculation, if there is no corresponding focal length of the lens is normal, then you can choose according to the product catalog similar models, the general choice is smaller than the calculated value, so the perspective will be larger. The above information provided by the Guangzhou Qianan Electronics Co., Ltd., I provide monitoring cameras and the corresponding accessories.
Have not seen a 2mm lens. Hemisphere, then generally 2.8mm, 3.6mm, 4mm, 6mm. Bolt 4mm, 6mm, 8mm, 12mm, 16mm. 4mm distance for about 15 meters, 6mm suitable for about 30 meters, 8mm about 40 meters, 12-16mm 50 meters -70 meters. 1/3 "sony chip.
