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Mastering Canon EOS Flash Photography, 2nd Edition by NK Guy

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Appendix F: Troubleshooting

Built-in flash

Why does the screen on my camera say “BUSY” with the flash symbol? The built-in flash won’t fire.

There are two possible reasons for this. The word “BUSY” appears briefly while the built-in flash charges up, during which time it’s unavailable. Also, if a built-in flash is fired too many times, then it goes into shutdown mode to avoid overheating. The unit has to cool down before the BUSY indicator goes away. Section 7.22.1.

There’s a dark curved shadow at the bottom of my photos.

The lens or lens hood is blocking the built-in flash unit. Try a smaller lens, remove the hood, or best yet, avoid built-in flash. Section 8.1.1.

Speedlite power issues

My flash unit will not power on.

Are the batteries in the ...

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