D7000 After firmware upgrade
Notice that those artifacts are gone. But what exchanged is increase in noise level and unwanted artifact (white pixel) appearing once in a while. Lens cap on btw.
nikonrumors.com/2010/12/03/nikon-promises-a-firmware-fix-for-the-d7000-hot-pixels-issue.aspx/
^ for those who don't understand what's going on...
To see the hot pixel, remember to set the video to 1080p and enlarge it on your screen...