5 meters away with the number of mm monitor camera lens appropriate?
If you need to look very wide and wide can also consider 2.8MM wide-angle lens. But the individual camera does not have this specification.
3.6MM or 4MM look wide. The The distance is 3-8 meters. The (1/3 target face)
Lens 8mm for stairwell; lens 6mm field angle 50 ° irradiation distance of 5-8 meters; lens 8mm viewing angle of 39.5 ° irradiation distance of 8-15 meters; lens 12mm viewing angle of 26.2 ° irradiation distance of 15-18 meters; lens 16mm angle 19.8 ° irradiation distance of 23-25 meters; according to this, the election is the best. If you want to see a little clear, you can choose this basis on the election of a little larger.
Monitor the camera lens 3.6mm (4mm) viewing angle of 69.9 °, identify the face is 3 meters to 5 meters.
