Partially push down the shutter button and the exposure and focusing systems spring into action, and a full depress takes the shot. That’s fine but most cameras have the choice of taking autofocus functionality away from the shutter button and allocating it to another control, the AF-ON button. This is on the rear of the body, which is why this focus technique is often called back button focusing. Aim the focus point where you want it and push the AF-ON button to autofocus. Once the subject is sharp, release the AF-ON button. The focus is locked and it stays put when the shutter button is used to take the picture. Back button focusing is a popular technique but many prefer using the default shutter button AF. Choose the best option for you!
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