Omax 72-52mm Step-Down Adapter RingProduct Description: Step Down adaptor ring Omax 72 52mm Adapter Ring easily screws onto the front of any 72mm Lens, and allows you to convert to the 52mm threads of accessory items (such as filters, hoods, flashes and lens converters) Omax 72 52mm Step Down Metal Adapter Ring The Omax step up step down ring is a special ring Adapter that allows you to mount your increased decreased diameter lens accessories such as filters, Adapters, lens, lens hood,