#1. "RE: Potential issues to be aware of with used D7000?" In response to Reply # 0
Personally I feel you are being over cautious.
While I have noticed others complaining about an easily nudged mode dial, I personally never had an issue with it.
There are a few people whom have had calibration issues with the focus mechanism, but that was easily addressed by a trip to Nikon service. And while there were people with legitimate calibration issues, a good number of the early soft focus issues were due to user error.
Another known issue early on that affect only a small amount of units was the lubricant spray caused by a defective seal on the mirror charging motor. I was an early adopter of the D7000 in which it was affected by that issue, and it was repaired under warranty by Nikon and I have yet to see a reappearance of the lubricant spray since the repair.
#3. "RE: Potential issues to be aware of with used D7000?" In response to Reply # 0 Wed 05-Dec-12 08:48 PM by Rassie
The mode dial on my 3-month old D7000 is tight enough - no more loose than the one on my D90. The dial on the D90 sometimes accidentally shifted when I put the camera in its bag or when taking it out. I quickly got into the habit of checking the dial position everytime before starting to shoot. Following the same habit with the D7000 means it's not an issue for me.
The D7000 has an autofocus fine tuning adjustment in the menus. If you suspect it's back-focusing then print a focus chart and test the camera's autofocus. If it's off you can try to fine-tune the autofocus till it's right. Mine was so far out that I had to get the camera back to Nikon to fix the back-focus. After I got the camera back I fine-tuned the autofocus on each of my lenses again, and I was pleasantly surprised at how well it focuses now. During a recent holiday I got some really sharp pictures. I know now that if my picture comes out soft it's poor technique on my part rather than faulty camera focus.
I have also found the white balance on the D7000 to be generally more accurate than that on my D90. Having said that, white balance doesn't bother me on either camera because I shoot in RAW and always fine tune white balance in Photoshop anyway.
There were some initial complaints of blown highlights in high-contrast scenes with early model D7000's, but I have not seen this problem on my D7000. It was an issue on my wife's D40, but then I set the camera to a lower default contrast for jpeg shots, and it's not a problem now (my wife shoots only jpeg). If the camera is set to produce higher contrast jpeg pictures you'll be more likely to blow highlights than with lower contrast settings. You can always increase contrast during post-processing. Also check the D7000 operator's manual. The metering can be fine tuned to reduce the likelyhood of blowing highlights or overexposing.
#4. "RE: Potential issues to be aware of with used D7000?" In response to Reply # 0
St Petersburg, RU
I might be concerned with what the store means by Demo. If it in fact is a store demo, it could be abused or very dirty inside if other store demos are any indication. It might mean a return-to-stock camera from its on-line shop which could be an indication that someone bought it and returned it for reasons unknown.
Other than that the D7000 is a stable well sorted out camera. The only one of real concern might be the oil droplets from a defective motor seal that a few forum members had. The intitial AF problems usually turned out to be the camera just needed to be learned better but a few needed calibration. Mine was excellent but suddenly developed a problem with AF on wider lenses only during an event. I took it to a Nikon warranty station and they adjusted it back to proper adjustment last May. The over exposure complaints that a few expressed were not camera problems but learning a slightly different bias towards preserving more shadows since the camera had a wider DR than any other DX camera. Even with the extended DR, many scenes are wider in tone range that what any camera can capture without data loss at either end of the amplitude range. That change in the metering was a good thing and you will find the metering to be quite good when you get used it. Unless your prior camera was a D3x or D800, at low ISO, the D7000 will be a step up in DR. If something does not seem right based on prior experience, just ask on the forum. We have probably heard it before and can suggest solution. One thing right off, consider increasing shutter speed on hand held shots for best crispness of images. The old rule of thumb of 1/(FL*1.5) for hand holding might be the minimum unless you have excellent hand holding technique. I use 1/125 minimum for hand holding my 85 1.4 but prefer 1/250 if the light is good enough for still subjects. Action shots will be higher of course. Good luck, it is an excellent camera. Stan St Petersburg Russia