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Negative imprinting
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Negative imprinting : ウィキペディア英語版
Negative imprinting

Negative imprinting is a feature of some film cameras, in which the date, shutter speed and aperture setting are recorded on the negative directly as the film is exposed.
The oldest patent on this is ( US patent #3,882,512 ), which uses half-silvered mirrors to direct the readout of a digital clock and mix it with the light rays coming through the main camera lens.
The type of imprinter used in modern SLR cameras is of the type described in (patent #4,001,846 ). This imprinter is fixed to the back of the camera on the film backing plate. It uses a small LED display for illumination and optics to focus the light onto a specific part of the film. The LED display is exposed on the negative at the same time the picture is taken.
The imprinter superimposes the date and other information on the image and this can be distracting. Digital cameras can often encode all the information in the image file itself. The Exif format is the most commonly used format.


抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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