Just got a D600 and fired off 500 jpgs at both ends doing the f/22 light cream white wall test, it's not exactly blue sky where I live right now, and found what may be some dust spots scattered about and 1 dark black blotch at the lower bottom only on the second test. The spots seem very, very, circular.
I also ordered the Artic Butterfly sensor cleaning kit and want to give it the full gamut go. I've seen numerous youtubes and posts on how to do it and except for experience I think I have that part down. However I live, feeling lucky, in a house just built this January and no matter which room I try there seems to be fine bits of dust floating all through the air. The only way I know that is when I turn all the lights in a room off and shine a spotlight then I can see the dust all around.
It seems it would be a fruitless exercise trying to give a good cleaning in such an environment. Does everybody else have clean rooms and if not what are your suggestions.
If I can clean this D600 myself I don't plan on sending it back.