|To assure fine photo results, Canon employs dust-resistant materials and structures to dramatically reduce dust generation within the EOS 400D DIGITAL. Measures also are taken to prevent dust from adhering to the sensor due to static electricity. A remarkable new function is the Self Cleaning Sensor Unit that actually vibrates the low-pass filter to remove dust particles from it. Additionally, by targeting image data for leftover dust after cleaning, the Dust Delete Function within the bundled software can be used after shooting to remove dust spots that may remain on the captured image. For photos that are consistently distinct and clear, this dust reduction system is essential.