Adapter Rings are a simple but important element of the LEE System, enabling the same holder and filters to be used with different lenses. Simply screw it onto the lens and then clip-on the LEE85 holder. The LEE85 Adapter Ring (40mm) screws on with a fluid action, thanks to the sturdy construction and aluminum screw thread. | Lee Filters | | 40mm Lens Thread to Lee 85 Filter Holder Adapter Ring | Best Buy