预 景深自动曝光锁定按钮。
While looking through the viewfinder, press the previewAE lock button.
按下频率锁定按钮前面板所有频率控制按钮将被禁用，防止意外改变频率。
FLOCK button. Pressing the frequency Lock button will disable all frequency determining controls on the front panel, to prevent accidental changes of frequency.
拍摄时，如果一直按住预景深自动曝光锁定按钮，相机就能以锁定的曝光值重复拍摄。
If the preview AE lock button is kept pressed while shooting, it is possible to shoot repeatedly with the locked exposure value.
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