> >Can you clarify this for me? How is dust entering the sensor >area? > > >>Leaving the lens on will NOT prevent dust from entering >the >>camera. >
If I were to guess, if you shoot in live view, the mirror is up, the shutter is open and the sensor is exposed. Combine that with a non-pro push / pull lens, and there is a better chance of the lens sucking dust in when you zoom in and blow dust back at the sensor when you zoom out. Again, I'm saying better chance, not that this will happen every time.
I never use live view (Just not a fan of it) and my sensor has been spotless since I picked it up.