I was looking for a webcam that shows a wide area left and right of me, so I compared the field of view of several webcams.
I was under the impression that a greater number as the FOV angle means that one can see more. To verify this, I looked up the specs of the Logitech C160 and C310 which I both own. I found that the C160 has a field of view of 50° while the C310 has 60°, so one would think that the C310 shows a bigger area of the wall behind me.
Since this is contrary to what I had said from gut feeling, I did a little experiment. I set both cameras next to each other facing a sheet of graph paper.
Then I looked at the picture from the webcam and marked the edges of the image with a pen on the paper (click for original resolution).
I found that in the C160 (field of view = 50°) I can see 21.6 cm of the paper and in the C310 (field of view = 60°) I can see only 19.2 cm.
To see the marks for the C160 in the C310 I have to move the C310 further away by a full 3 cm.
This makes no sense to me, can someone clarify what "field of view" actually means?