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Field of View (FOV)

For radiometric collectors, the range of angles over which they are sensitive to incoming light.  Usually expressed as the full-width half-maximum (FWHM), but sometimes as the half-angle.  For example, a receiver with a 10 FWHM FOV has 50% of its peak sensitivity at 5 from its central axis.  This could also be described as a 5 half-angle.

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