What Is AE-L / AF-L on a Camera?
Updated 2026-06-19
Direct Answer
AE-L / AF-L means Auto Exposure Lock / Auto Focus Lock. Depending on your camera settings, the button can hold the metered exposure, hold the current focus distance, or do both while you recompose and shoot.
The Short Answer
AE-L is useful when you want the camera to keep the same exposure even after the framing changes. AF-L is useful when you want to focus once, lock that focus distance, and then recompose without the camera refocusing. Many cameras let you customize the AE-L / AF-L button, so it can behave as exposure lock, focus lock, AF-ON, or a combined lock.
The Full Explanation
AE-L stands for Auto Exposure Lock. Pressing it tells the camera to keep the current metered exposure instead of recalculating brightness as you move the camera. This helps when the subject and background have very different brightness levels.
AF-L stands for Auto Focus Lock. Pressing it tells the camera to keep the current focus distance. This is useful for focus-and-recompose shooting, static subjects, and scenes where the autofocus point might jump to the wrong object.
On many Nikon and Fujifilm cameras, AE-L and AF-L are printed on one button because the same control can be assigned to multiple behaviors. On other systems, similar functions may be mapped to a star button, custom button, exposure-lock button, or AF-ON button.
AE-L / AF-L is less important if you use full manual exposure, back-button focus, and subject-tracking autofocus all the time. It is still a useful tool when working in aperture priority, shutter priority, or tricky backlit scenes.
What This Means for You
Use AE-L when brightness should stay fixed while you recompose, especially in backlight or high-contrast scenes.
Use AF-L when focus should stay fixed and you do not want the camera to refocus on another subject.
Check your camera customization menu because AE-L / AF-L behavior is often user-configurable.
Related Questions
AF-ON activates autofocus independently from the shutter button and is often used for back-button focus.
Use AF-S for static subjects, AF-C for moving subjects, and subject tracking when the camera can reliably identify the target.
Set aperture for creative intent, adjust shutter speed for the exposure meter, and raise ISO only when needed.
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