You've probably heard about the D200 firmware upgrade and that, on paper, it looks pretty useless (image authentication for law enforcement? wow...) but what you may not know about are the things that nikon fixed without making it official. People with Sigma lenses can now use the AF-ON button. Apparantly, a pretty big deal for people with Sigma lenses. And, something that affects me, the banding issue is MUCH improved. I had slight banding from the factory (SN in the 2000s, so fairly early production run), and after a few test shots at ISO400 and ISO800 of a ceiling lamp shows little to no banding left. Good news, since I'm too lazy to send mine in. Just an FYI for the parties involved.