| 摘要 |
An optical low-pass filter is built with circular phase components consisting of randomly distributed convex and concave surfaces. The area of the phase components is structured to cover +E,fra 1/2+EE the entire surface area of the low-pass filter. Moreover, the phase components are set to a height such that the phase difference between the light passing through the phase components and the other areas of the filter is +E,fra 1/2+EE its wavelength. The optical low-pass filter is installed in front of the photometric optical system. It is therefore possible to precisely measure light regardless of incidence of light from the photographic subject even when using photometric sensors that have been divided into multiple units.
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