| 摘要 |
A filter for adjusting an amount of light, in which an ND filter 7 is loaded and unloaded by aperture blades not shown in the figure; (a) the ND filter 7 is loaded in the light path, and the liquid crystal cell is controlled to make the transmittance minimum by the controlling voltage, so as to attain the minimum transmittance; (b) the ND filter 7 is unloaded from the light path, and the liquid crystal cell is controlled to make the transmittance maximum by the controlling voltage, so as to attain the maximum transmittance; and the liquid crystal is controlled to have transmittance of an intermediate level by the controlling voltage, so as to attain intermediate transmittance.
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