Canon POWERSHOT A3100IS User Manual page 128

Troubleshooting
image is blurred.
Press the shutter button halfway to focus on the subject, then press fully to
shoot (p. 23).
Shoot the subject within the focusing distance (p. 140).
Set the [AF-assist Beam] to [On] (p. 121 ).
Confirm that functions which you do not intend to use (macro, etc.) are not set.
Shoot using the focus lock or AF lock (pp. 76, 81 ).
Even when you press the shutter button halfway, the AF frame
does not appear, and the camera does not focus.
if you center on the light and dark contrasting area of the subject and push the
shutter button halfway, or repeatedly push the shutter button halfway, the frame
will appear and the camera will focus.
Subject is too dark.
Set the flash to _ (p. 67).
Adjust the brightness with exposure compensation (p. 66).
Use the AE lock, or spot metering to shoot (pp. 81, 82).
Subject is too bright (overexposed).
Set the flash to _ (p. 58).
Adjust the brightness with exposure compensation (p. 66).
Use the AE lock, or spot metering to shoot (pp. 81, 82).
Reduce the light illuminating the subject.
image is dark even though the flash fired (p. 26).
increase the ]SO speed (p. 71 ).
Shoot within an appropriate distance for flash photography (p. 67).
image taken using the flash is too bright (overexposed).
Shoot within an appropriate distance for flash photography (p. 67).
Set the flash to _) (p. 58).
White dots appear on the image when shooting with the flash.
Light from the flash has reflected off dust particles or other objects in the air.
image appears rough or grainy.
Shoot with the ISO speed on a lower setting (p. 71 ).
Depending on the Shooting mode, when shooting in a high ]SO speed the image
may appear rough or grainy (p. 55).
Eyes appear red (p. 83).
Set the [Red-Eye Lamp] to [On] (p. 122). When shooting with the flash, the lamp
(on the front of the camera) lights (p. 42), and for approximately 1 second while
the camera is reducing red-eye, it is not possible to shoot. It is more effective if
the subject is looking directly at the lamp. Even better results can be obtained by
increasing the lighting in indoor settings or approaching closer to the subject.
Recording images to the memory card takes a long time, or
continuous shooting slows down.
Perform a low-level format of the memory card in the camera (p. 51 ).