Used T1i with spot on sensor

My 500D has also a couple of dust spots but, unlike what others here claim, the dust somehow got under the antialiasing filter and can't be cleaned. I do not change lenses a lot and I certainly do not change them (or use the camera in general) in a dusty environment. Maybe Canon's design fault.

That being said, this spot looks very well defined for f/8, it shouldn't be like this. The second spot which is less visible looks just about right for f/8 though.

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