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When a field of view is described as 120°, that refers to the total angle. So, 60° to the left of center and 60° to the right. Most camera lenses show a very restricted subset of the field of view perceived by the human eye and vision system. It is probably the case that the system is measured across the diagonal from corner-to-corner of a rectangle, ...


2

The lens field is circular, and does have an angular cone of view, like your funnel. However, the camera sensor captures a rectangular area within that cone, typically which just tightly fits into that cone. Meaning, the diagonal of that rectangle just fits the cone (normally, but there can be exceptions with smaller sensors). The cone has an circular ...


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