Monitor camera lens 4-6-8-12-16MM difference.
4 of 3-4 meters wide angle of 45 degrees, 6 of 6-8 meters wide angle of 38 angle, 8 of 8-12 meters wide angle of 35 degrees, 12 of 12-15 meters wide angle of 30 degrees, 16 of 20 meters / wide angle 27-28 degrees,
The bigger the number of the lens looks farther. But the smaller the angle of view
These numbers on the lens label refer to the focal length of the lens. The larger the value, the farther the distance the lens can reach, but the angle becomes smaller.
