I checked my new G7 for dust spots recently and found that it had some. I cleaned the imager with a rocket duster and found that I still have some - sort of. I've discovered that the dust spots only really show up if you test at f22 and to a lesser degree at f16. At f11 the spots are essentially gone. You have to advance the clarity in Lightroom to really see the spots and NONE of them show up using the spot removal tool, visualize spots - even the ones at f22. Since 4/3 sensors have two stops of depth of field more than full-frame cameras, I almost never use f22 and rarely use f16 because I know that most of my lenses max out in sharpness by f8. Therefore, I am not worrying about this dust. Should I be? The three images are f22 unedited, f22 optimized to show spots and f11 optimized to show spots.