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Anonymous
If you can see it at f/3.5, there's probably more dust in there.
Take a shot of a clean piece of paper or a clear sky at the smallest aperture you can (f/22 or so) and then auto-level the shot in photoshop.
Google for how to clean the ccd, it's not as difficult as many people dramatize it to be.
http://www.luminous-landscape.com/essays/sensor-cleaning.shtml is a good place to start, but don't just rely on that.
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