Canon EOS REBEL T5I Instruction Manual page 53

_ Shooting Movies
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• -r When you press the shutter button halfway to autofocus during movie
shooting, the following phenomena may occur.
- Focus may become far off momentarily.
• The brightness of the recorded movie may be different from that of the
actual scene.
- The recorded movie may be momentarily still.
- Lens operation noise may be recorded.
- You may not take a still photo when focus is not achieved in cases such as
the subject is moving.
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