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Canon EOS 40D Guide to Digital Photography by David D. Busch

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Dust Delete Data

This menu choice lets you “take a picture” of any dust or other particles that may be adhering to your sensor. The 40D will then append information about the location of this dust to your photos, so that the Digital Photo Professional software can use this reference information to identify dust in your images and remove it automatically. You should capture a Dust Delete Data photo from time to time as your final line of defense against sensor dust.

To use this feature, select Dust Delete Data to produce the screen shown in Figure 3.17. Select OK and press the Set button. The camera will first perform a self-cleaning operation by applying ultrasonic vibration to the low-pass filter that resides on top of the sensor. Then, a screen ...

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