I have two series of photos shot on my iphone 6s on 10.3.2. The first series is in the regular frame, and the second series is in the "square" frame. I'm using exiftool 11.01 on macOS 10.11.6.
From the command line, when I run
exiftool -a -G0:1 on photos from the first series, I get:
[Composite] Field Of View : 63.7 deg
And when I run the same on the second series, I get:
[Composite] Field Of View : 49.6 deg
Both of these reported values differ significantly from all of Apple's official technical specs for the camera, seen here.
Can someone please clarify the discrepancy, and indicate which FOV value I should use when asked for the "angular field of view," i.e., the total opening angle of the camera lens?