Narrowband pass filters are generally poor as narrowband angle filters. A tilted narrowband pass filter, however, is an improved narrowband angle filter, but only for rays in one plane of incidence. It is shown that a combination of two tilted narrowband pass filters will select light from all narrow angle patches in an incident cone. Furthermore, a design is presented for a narrow-angle filter for three wavelengths, enabling transmission of tristimulus color gamut images, while rejecting out-of-band sources and off-angle sources.
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