#11. "RE: How'd I screw up? Exposures off as zoom in" In response to In response to 9 Wed 15-May-13 03:47 AM by GiantTristan
If the lens works ok with the D200, it must be either the camera or the interface camera/lens that is at fault. How about renting another 24-70 lens and checking whether the problem persists. If yes, this definitely confirms that the camera does not perform properly. You might also want to clean the electrical contacts of both lens and camera.
Since you mention "bright sun light" - does this also happen, if you close down the aperture to f/8 or even f/11?