Adaptor 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 Adaptor Ring (40mm) screws on with a fluid action, thanks to the sturdy construction and aluminium screw thread. All LEE85 Adaptor rings are wide-angle, and are available in a variety of thread sizes to fit each of your lenses.