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Generally 16mm lens Angle can reach 20 degrees, can see the face of infrared distance between 35 and 50 meters
The Angle of the average 12mm lens can reach 26 degrees. The infrared distance of the face can be seen from 20 to 35 meters.
Generally, the Angle of the 6mm lens can reach 50 degrees. The infrared distance of the face can be seen from about 5 to 10 meters.
Generally, the Angle of 3.6 mm lens can reach 75 degrees. The infrared distance of the face can be seen from about 0 to 5 meters.
