The Vivitar 72mm Wide-Angle and Telephoto Adapter Lens Kit contains both 0.43x wide-angle and 2.5x telephoto lens adapters, which can be used on lenses with a filter ring diameter of 72mm to either narrow or broaden the effective field of view. Three adapter rings are also included to facilitate mounting of these lenses to lenses with 62mm, 67mm, or 77mm filter ring diameters.