Okay,
So the FoV measurements for the IPC-T283H-MU are below:
2.8 mm, horizontal FOV 119.6°, vertical FOV 60°, diagonal FOV 149°
4 mm, horizontal FOV 96.8°, vertical FOV 50°, diagonal FOV 115°
If you switch to the 4mm model you will lose about 11.5 degrees of horizontal coverage on both the...