Canon Powershot SD890 IS DIGITAL ELPH User Manual page 86

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You are recommended to use a memory card that has been
formatted in your camera to shoot movies (p. 178). The card
supplied with the camera may be used without further
formatting.
Be careful of the following while recording.
- Try not to touch the microphone (p. 42).
- Do not press any buttons other than the shutter button.
The sound that buttons make will be recorded in the movie.
- The camera will automatically adjust the exposure and
white balance to suit the shooting conditions during a
recording. Please note, however, that the sounds made by
the camera while automatically adjusting the exposure
may also be recorded.
The focus and optical zoom settings remain fixed for
subsequent frames at the values selected for the first frame.