20. BACK BUTTON FOCUS
ONE OF THE most popular customizations among professional photographers is Back Button Focus. With this technique, a button on the back of the camera is used to activate focus, and the shutter release only performs the action of taking a photo. Check your camera’s menu to see if this feature is offered. Most mid-level to high-end models have it.
The standard operation of autofocus on all AF cameras is for focusing to begin when the shutter release is held halfway down. In general, this is a pretty good system that works well in many situations. If your subject is off-center, you can perform the Focus Lock technique previously ...
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