Dome Lense

What size of the camera lens?

I'm about to buy a night vision dome camera external security, but what size is the best, is the lowest in the best or the highest, I have the choice of these sizes, 3.6mm, 6mm, 8mm, 12mm, 16mm. Thanks in advance

These are the focal lengths of 3.6 mm is the 16 mm wide and narrow, in terms of field of view. To view a wider area, choose a wide mm focal length. In a narrow space, you will not be as wide. 6mm or 8mm is probably good for general use, but check the specifications of the lenses "Angle of vision" before buying.

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