When you have the camera set to any of the shooting modes

other than Macro (see Using the Shooting Modes on page 38), the camera will attempt to auto focus still pictures using the normal focus range of 0.5 m (20 in) to infinity. However, when the camera cannot focus in these shooting modes, one of the following will occur:

zThe AF viewfinder light will blink green and the focus brackets in Live View will turn red. The camera will still take the picture, but the picture may be out of focus. To focus the picture, release the Shutter button, re-frame the subject for your picture, and then press the Shutter button halfway down again.

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 an object about the same distance away but in a higher-contrast region, and then, without releasing the Shutter button, point the camera at the subject you were originally trying to photograph (see Using Focus Lock on page 34). You can also simply turn on more light, if that is possible.

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HP Photosmart M305/M307 User’s Manual