Could someone explain what exactly user level mainenance, such as cleaning certain places can and shouldn't be done to a camera. Specifically I'm getting mixed messages on cleaning the sensor. I"m reading that it can be done at our level, but should not be done, due to niokons waranty. I've seen supposed sensor cleaning adaptors that let you see the stuff on your sensor, which I think are overpriced, I'd rather just take some tool and clean the whole dang thing. Maybe you could even get a stickied tutorial on this kind of stuff and the user level that should attempt this. Any help on this would be greatly appreciated. I have shot sky shots with two different lenses and the spots on the pictures are in the exact spots on both shots, so it has to be sensor. if you look to the left top and the bottom right of the bird you can see the "spots" they show up on all of my pictures taken of the sky with two different lenses.