Auto exposure lock gives you control over what to expose for
There are times when you will want to expose for something, change the way you frame the shot, and then take the picture. This often results in a more visually appealing composition.
Auto exposure lock
A push-button, switch, or lever that locks in exposure after the initial reading has been made, regardless of a change in camera position or light conditions after the lock is activated.
Auto Exposure Lock (AE Lock)
You can adjust exposures with a procedure called autoexposure lock (AE Lock) that works much like focus lock.
Auto exposure Lock. Metering feature that used to hold the exposure setting when used in the automatic mode.
Auto Exposure lock
AE
Automatic Exposure. A method of linking the camera exposure settings to the ambient or reflected light level.
I use Auto Exposure lock and / or exposure compensation instead to arrive at the correct exposure.
RECOMMENDATIONS
Few cameras meet all these requirements. I wish more did.
AE LOCK - Auto Exposure Lock or "AE-L" - permits you to take an exposure meter reading from part of a scene and to keep the reading to apply it to the entire composition.
Auto Focus / Auto Exposure Lock
The AFL / AEL button is used to measure exposure and auto focus and then lock them.
Advanced cameras offer some kind of Auto Exposure Lock (aka AE Lock, Exposure Memory Lock or EV Lock).
If your subject is off-centre and has a very bright or very dark background, metering from the whole frame may fail to provide the correct exposure. Your camera's Auto Exposure Lock (AE-L) facility can help here.
You can use your jeans, a gray photo backpack, grayish tree bark, a rock, etc. Once you have this reading, push the Auto Exposure lock button on the camera to lock and retain that reading in place, and then re-compose the picture and shoot.
 See also: Camera, Exposure lock, Image, Exposure, Auto
  
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