>All SLR/DSL Lens that have >auto focus. regardless of quality tend wobble as the move in >or out.
While the entry level lenses like the 18-55mm and 55-200mm change length when zooming and have front elements that rotate and move out when focusing, the top tier lenses feature internal focusing (IF) so the front elements do not move or rotate and many of the zooms don't change length when changing focal length. They are also built using metal to much tighter tollerances and do not wobble when zooming or focusing.
>Because regardless of mechanical tolerances nothing >fits perfectly tight. So there is compensation for that >movement.
VR was not designed to compensate for loose mechanical tolerances in the lens.
Keep in mind that even in Continuous AF (AF-C) mode the AF system locks focus when the shutter is released.
>Image stabilization is where the camera designed to compensate >for a person's inability to hold the camera perfectly still. I >know of no one that can hand hold a camera perfectly still. >Even a camera on Tripod on a windy day , a camera is subject >to camera shake. So the need for both
Nikon: VR (Vibration Reduction) Canon: IS (Image Stabilization) Sigma: OS (Optical Stabilization) Tamron: VC (Vibration Compensation)
They are different acronyms and names for similar systems that perform the same function. In other words, different names for the same feature that does the same thing.
All of these systems were designed to compensate for user induced movement (handshake) by mechanically moving an element or group of elements inside the lens using peizo motors to keep the optical axis perpendicular to the sensor plane. While some of the Supertelephotos have VR with tripod mode most of the lenses with VR don't have tripod mode. Good Luck and Enjoy your Nikons!