To focus the picture, release the Shutter button,
If the AF viewfinder light continues to blink green and the focus brackets continue to turn red after several tries, there may not be enough contrast or light in the focus region.
Try using a technique called Focus Lock to focus on a
•The AF viewfinder light will blink green, the focus brackets will turn red, and the Macro 
icon will blink in the Live View screen. In this case, the camera detects that the focus is closer than the normal range. The camera will still take the picture, but the picture may be out of focus. To focus the picture, either move farther away from the subject you are trying to photograph, or set the camera to the Macro shooting mode (see Using the Shooting Modes on page 42).
If the camera is set to the Macro 
shooting mode and the camera cannot focus, the Live View screen displays a blinking Macro 
icon, an error message, and the focus brackets turn red. Both viewfinder lights will also blink. In these cases, the camera will not take the picture.
If the subject for the picture is not within the Macro range (10 to 80 cm or 4 to 32 in), either move farther away from or closer to the subject, or set the camera to a shooting mode other than Macro 
(see Using the Shooting Modes on page 42).
