Dahua IPC-HDW5631R-ZE
Angle of view H:91°~27° , V:58°~18°
Dahua IPC-HDBW4231F-AS
Angle of view H: 87° (110°, 51°), V:48° (58°, 30°)
Can some explained the angle of view. The above two are sample of cameras in looking at. Is the angle of view 91 degrees and 87 respectively or 110 for the...