While Nikon doesn't do a great job on focusing (figure 1), it does a great job on VR (vibration reduction, or Image Stabilisation for Cannon and Optical SteadyShot for Sony).

Picture 2 is shot under a low-light condition, which my camera model is not expensive enough to handle it, so I limit the ISO to 6400. If the picture is still underexposed, then I just give up since that means my camera can't capture this scene.

However, with limited light and the shutter speed well below the safety range (usually the safe shutter speed is 1 divided by focal length, in this case, 600mm should use at most 1/600s, which is 1/640s in my camera), it managed to capture one photo that is in focus, and sharp enough to let DXO Photolab to recognize all the details and enhance them.

Amazing. (of course, DXO is also an amazing software)