Auto exposure lock

A DSLR function that allows the camera user to lock the exposure reading from anywhere in the scene.

An auto-exposure lock is a DSLR function that allows the camera user to lock the exposure reading from anywhere in the scene.

A camera in automatic exposure or autoexposure (usually initialized as AE) mode automatically calculates and adjusts exposure settings to match (as closely as possible) the subject's mid-tone to the mid-tone of the photograph. For most cameras, this means using an on-board TTL exposure meter.

Aperture priority (commonly abbreviated as A, or Av for aperture value) mode gives the photographer manual control of the aperture, whilst the camera automatically adjusts the shutter speed to achieve the exposure specified by the TTL meter. Shutter priority (often abbreviated as S, or Tv for time value) mode gives manual shutter control, with automatic aperture compensation. In each case, the actual exposure level is still determined by the camera's exposure meter.

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Auto exposure lock
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Adapted from content published on wikipedia.org
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  • Image by Steve Lyon: Some rights reserved — from flic.kr
Last modified on August 5, 2020, 2:44 pm
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