Dorr Series VII Adapter Ring 72mm is a universal thread for attaching auxillery items to lenses. It is used in conjunction with standard adapters to form a more secure attachment, when using heavier coversion lenses.
Dorr Series VII Adapter Ring 72mm is a universal thread for attaching auxillery items to lenses. It is used in conjunction with standard adapters to form a more secure attachment, when using heavier coversion lenses.