I used to have quite a lot of trouble with dust, but after cleaning the sensor AND the mirror chamber, I don't seem to see much if any. I suspect that quite a lot of so called dust is debris and dirt from the manufacturing of the camera, including oil on the mirror and shutter mechanisms.
I suspect Don is right about some lenses being worse than others. My lenses tend to be internal focussing designs, or primes with little extension.
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