Field of View - FOV
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Field of view or FOV is what is visible through the camera-lens combination at a particular position and orientation in space; objects outside the FOV when the image is made are not captured.
Field of view is expressed in linear measurements (meters, mm; feet, inches) for a given working distance.
FOV is commonly measured horizontally, but also vertically and diagonally.
The FOV calculation -or even just its estimation- is particularly useful for photographers to select the lens (by focal length) to photograph a subject.
The formula is derived in geometry from similar triangles and is:
( s / d ) = ( i / f )
where:
s = the actual size of the subject
d = the distance from the exit pupil of the lens to the subject
i = the image dimension and
f = the effective focal length.
For example, a D3 or D3s FX sensor will have an image dimension 'i' of 36mm horizontally, 23.9mm vertically and 43.2mm diagonally.
Angle of View - AOV or angular field of view is measured in degrees of arc.
