| 摘要 |
PURPOSE:To eliminate folding distortion in vertical sampling by arranging a vertical optical low-pass filter or optical correcting glass which has the same optical path with it in front of an image pickup element when a field image is picked up by an image pickup device for still video or the like. CONSTITUTION:An operation knob 14 is moved to a field image mode side and a changeover lever 13 is rotated around a fulcrum 13a by a toggle spring 12; and an optical path L is passed through the vertical optical low-pass filter 8 which is provided newly and a field mode discriminating switch 10 is turned on to discriminate and detect the mode. Subject image information which is not shown in a figure is made incident on the image pickup element 16 through an optical system 7 such as a lens and a stop, said filter 8, a horizontal optical low-pass filter, and an IR cutting filter 15, and the information is converted into an electric signal. Here, the filter 8 may be the optical correcting glass 9 positioned on the same optical path and made to replace the filter 8 by the lever 13 when used.
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