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Lock metering numerical AE-L also is Camcorder Battery equivalent to lock exposure, is used in the automatic exposure control for lock exposure. The camera in the film, will take on the scenic spot to express the main body, if the subject is not in the picture center. May first at the main metering, and use the AE-L lock function lock exposure value, then according to your idea to composition, again focus shutter.
 
The application of exposure lock usually in three ways: the first kind, most digital cameras exposure for special lock button, relaxed after the press can be according to your idea to composition; The TOSHIBA Camcorder Battery second kind, the part of the digital camera ae lock and focus, through the press shutter half to realize, if metering points and to focus not consistent, so will first metering lock, and then to composition, the focus; Third: a digital camera does not provide a separate ae lock, can the metering data record down first, and then through the digital camera M block setting, and composition, the focus.
 
If the shooting environment in a backlight state, shoot people photo, can choose to face the first character to spot metering, and then press the AE lock-L, so that in the new composition won't change predict exposure value.
 
For automatic focus lock and the ae lock operation is to improve the level of the portrait photography best choice.
 
The toshiba gsc-bt7 battery main body lock not exposure, again through the viewfinder according to your idea to composition, press the shutter photography to focus.