Focusing the Camera
The focus brackets in the Live View screen show the focus region for the still picture you are taking (see Using Live View on page 37). When you press the Shutter button halfway down to take a still picture, the camera automatically measures and locks the focus and exposure in the focus region. The focus brackets in the Live View screen turn green when the camera has found and locked the focus and exposure. This is called auto focus.
NOTE: The green brackets surround the area(s) in focus to help you ensure that the camera is focused on the correct subject. If the camera keeps focusing on the wrong subject, try using Spot focus (see Auto Focus Area on page 74).
Obtaining Optimum Focus and Exposure
When you have the camera set to a focus range other than Macro 
(see Using the Focus Range Settings on page 42), the camera will attempt to auto focus. However, when the camera cannot focus using one of these focus range settings, the focus brackets in Live View turn red. This indicates that the picture may be out of focus either because the camera had difficulty focusing on the subject or because the focus range is too close. The camera will still take the picture, but you should release the Shutter button, then try
Taking Pictures and Recording Video Clips | 39 |