Add the 1.6X Tele-Converter to the front of your lens to shift its focal range in the telephoto direction. The perfect tool when it's inconvenient, dangerous, or even impossible to move as close to the subject as you'd like. The 1.6X Tele-Converter alters your zoom's focal length range with no appreciable light loss. Note that the Tele-Converter offers partial zooming, vignetting will occur at mid-range through full wide angle. The Tele-Converter is specially effective in "run-and-gun" shooting situations because it attaches quickly to the front of the existing lens with Century's popular bayonet mount.