| 摘要 |
An optical low-pass filter used in association with an imaging element which has a plurality of pixels arranged in vertical and horizontal direction with regularity, is provided with first through third birefringent plates arranged in the order from a light incident side. The low-pass filter separates an incident ray into four rays, a separation width of the rays in the vertical direction being deltav, and a separation width of the rays in the horizontal direction being deltah. A separation angles of the first through third birefringent plates are theta, (theta-90°) and 0°, respectively, and separation widths of the first through third birefringent plates are (deltavxsin theta), (deltavxcos theta) and deltah, respectively.
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