Focal Length (mm) into Angle of View (degree)

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How to calculate Focal Length (mm) into Angle of View (degree)

fov = 2 * atan(frameUtilization * filmFrameDim/2 / focalLength)

The frame size for 35 mm film is 24×36 mm. The utilization is typically 95%.

Source:

http://www.worldserver.com/turk/quicktimevr/calculators.html