The VC (Vibration Compensation) mechanism allows the use of shutter speeds that are much slower than otherwise possible, with no perceptible increase in image blur. It automatically detects movement of the camera and compensates for camera shake when shooting a moving object. This feature is a must in a lens with this longer range of focal length.
This lens is designed exclusively for DSLR cameras with smaller-size sensors. It is NOT compatible with 35mm film cameras and DSLR cameras with image sensors larger than 24 x 16mm.