Quote:
Originally Posted by cowislander
Sensor dirt/dust is especially obvious in images that are shot with the lens fully stopped down, i.e., f22 or thereabouts. The D20 has an built in ultrasonic cleaning utility. Get your manual out and look for sensor cleaning. Its buried in the menu system, once you find it give it a try. It essentially puts a 30 second ultrasonic signal through the sensor dislodging any dust particles. Very simple to do. I also agree with the post saying that using dust off with the mirror locked up is a good technique. Acetone......I dont think so.
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The Canon 20D does not have the ultrasonic lens cleaner (I know, I used to have a 20D as a backup body). Canon didn't start that until somewhere around the 40D and 5D MkII, IIRC.