18. FOCUS LOCK FOR A BETTER COMPOSITION
FOCUS LOCK IS one of most basic but useful techniques with an autofocus camera. This will only work when the camera is in Single AF Mode. The purpose of this is to allow you to focus on a particular subject and then recompose the frame as you wish. This gives you the best of both worlds: the focus point you desire and the framing of your choice.
The shutter release button is key to this technique. When the shutter button is not being pressed the camera will power down and go into sleep mode in order to save battery power. This sleep mode will usually start after about 10 to 30 seconds of inactivity, but ...
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