Hi Marciano,
For the 4:3 and 16:9 cases, I couldn't get the same results as yours.
Based on a 84 deg diagonal FOV, I came up with these values of Horizontal and Vertical FOV:
Aspect ratio 3:2: HFOV = 73.68, VFOV = 53.08
Aspect ratio 4:3: HFOV = 71.53, VFOV = 56.76
Aspect ratio 16:9: HFOV =...