What is the number of millimeters that monitor the camera?
Surveillance cameras generally see the 3.6 6 8 12 16MM These lenses are generally divided into wide-angle, ordinary, long focal length (these are fixed focus)
General surveillance camera to see the 4mm, 6mm, 8mm, 12mm, 16mm These lenses are generally divided into wide-angle, ordinary, long focal length, you can according to the parameters of the range, the most important thing is your camera installation location to You monitor the distance of the area
And then the zoom is generally wide angle is more than 90 degrees above the normal is about 30 degrees long focal length is less than 20 degrees
