What 2.8mm cameras do you have though? Its the field of view you need to look at, the 4mm in colorvu has a 94 degree fov but my old 2.8mm 2332 turrets had a 80 degree fov at 2mp
I have
these (DS-2CD2363G0-I) all around which states 2.8 mm, horizontal FOV: 97°, vertical FOV: 63°, diagonal FOV: 120°
The new ones being mentioned are:
2.8 mm, horizontal FOV: 109°, vertical FOV: 55°, diagonal FOV: 138°
4 mm, horizontal FOV: 94°, vertical FOV: 48°, diagonal FOV: 115°
6 mm, horizontal FOV: 57°, vertical FOV: 31°, diagonal FOV: 67°
The colour one could make it easier to see the cars and any shift characters that walk past checking if the cars doors are locked. At the moment in the night number plates can be reflective and the face obscured due to the street lights.