Нашел ссылку на эту тему.
Если я правильно понял текст, CCD-матрица не создает заряд, достаточный для притягивания пыли, но вот конструкция Canon 10D такова, что меньше проблем, чем у Nikon D100.
Почему я что-то не понял.
http://www.planetneil.com/nikon/ccd-cleaning.html
politically incorrect / technically correct ..
The dust is actually on the Anti-Aliasing Filter over the CCD, and not the CCD itself. This filter in the D100 is closer to the sensor than it is to the CMOS sensor of the Canon 10D, which is why the Nikon D100 shows up dust spots more readily than the Canon 10D.
And just as an aside, the CCD doesn't attract more dust than a CMOS device would. It's a myth that the CCD creates a static charge that attracts dust.
Also, most people insist that you should turn the camera to face down when you mount lenses to avoid dust falling into the mirror chamber. Good advice that might just be pointless if the rear element of the lens that you're mounting, has dust particles on it. Besides .. dust floats. In the end your lens will get into the mirror chamber anyway.