Camera vibration is the bane of hand-held photography. The term "camera vibration" or "camera shake" is used to describe the underlying cause of a blurry photo that occurs when the photographer moves the camera at the instant the shutter fires. Camera vibration is the primary cause of poor image quality in handheld photography. Tamron's VC mechanism can usually deliver critically sharp images even in situations where the effect of camera vibration is most pronounced, such as when using slow shutter speeds in low light or shooting at long telephoto settings. It also delivers exceedingly stable viewfinder images without annoying motion delay so you can concentrate on framing.