I want to get the accurate field of view (FOV) number of the iPhone back cameras, and I found a really useful iOS Device Capture Format Specifications in this question and system API method activeFormat.videoFieldOfView.
After my practical experience, I realized that the FOV numbers listed in tables are little different and more accurate than the fov number from the grammatical way using system API .
For example, the FOV number of iPhone X back camera listed in that reference is 60.983: please check the reference table here
however, the system API activeFormat.videoFieldOfView returns 69.654 :
Active Format: <AVCaptureDeviceFormat: 0x2815080f0 'vide'/'420v' 1280x 720, { 1-240 fps}, fov:69.654, binned, supports vis, max zoom:67.50 (upscales @1.50), AF System:1, ISO:24.0-960.0, SS:0.000045-1.000000>
And in my practical development, I prefer the fov number listed in reference table is more accurate.
So here are two following questions:
why is there difference of camera fov numbers between the system API and the reference table?
Since the existing reference only includes iPhone models before iPhone X, so how can I find the latest iPhone series camera reference table (iPhone Xs\iPhone Xs Max\iPhone XR\iPhone 11\iPhone 11 Pro\iPhone 11 Pro Max)?