So I'm out happily shooting wildflowers in the desert and I notice a spot just off center. Turning off the camera and rotating the lens tells me it's not on the lens, so I didn't worry about it and planned to clean it when I got home.
When I did get home, I took off the lens and verified that the spot is still visible. So I got out some PEC pads and Eclipse and went over the mirror and bottom of the pentaprism. I also cleaned the viewfinder eyepiece with a micro-sized Lenspen. The spot remains (and I'm positive it's laughing at me.)
I'm forced to conclude that, somehow, a bit of dust got up into the viewfinder area.
I realize the D7000 is not weather sealed to the extent the professional bodies are, but I guess I'm surprised that this happened. I would have expected some amount of resistance to this.
Am I wrong or is this just the way it is? Is it common to all you folks and do you just grin and bear it? It doesn't affect the images at all, but it's like that first scratch on a new car to me!