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  Glossary Of Photography Terms [1]
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Focus Lock  Focus lock is a feature in many cameras that allows photographers to lock the focus on a specific subject or area before recomposing the shot. This technique is particularly useful in situations where the subject is not in the center of the frame or when the photographer wants to ensure a specific part of the image remains in focus despite changes in composition.
To use focus lock, the photographer typically frames the shot, half-presses the shutter button (or uses a dedicated focus lock button), allowing the camera to autofocus on the chosen subject, and then holds the focus by maintaining the pressure on the shutter button while recomposing the shot. Once satisfied with the composition, the photographer can fully depress the shutter button to capture the image with the locked focus.

 
 
 
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