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autoexposure bracketing:

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. Release of the lock button returns the exposure system to normal. Useful for making highlight or shadow readings of select portions of the frame, and an essential feature for critical exposure control with automated cameras.

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autoexposure bracketing:

AutoExposure Bracketing performs automatic exposure bracketing with varied shutter speedand/or aperture.
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