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Troubleshooting Guide
The camera cannot be used with EF-S or EF-M lenses (p.52).
Install a recharged battery in the camera (p.40).
Make sure the card is properly inserted (p.43).
If you are using an SD card, slide the card’s write-protect switch to the
Write/Erase setting (p.43).
If the card is full, replace the card or delete unnecessary images to
make space (p.43, 328).
If you try to focus in the One-Shot AF mode and the focus indicator
<o> in the viewfinder blinks, a picture cannot be taken. Press the
shutter button halfway again to refocus automatically, or focus
manually (p.55, 141).
If a card error message is displayed, see page 46 or 487.
Set the AF operation to One-Shot AF (p.87). Focus lock is not possible
in the AI Servo AF, or when servo takes effect in AI Focus AF (p.83).
Shooting-Related Problems
The lens cannot be attached.
The viewfinder is dark.
No images can be shot or recorded.
The card cannot be used.
I cannot lock the focus and recompose the shot.