This Genuine OEM Nikon PK-11A Auto Extension Ring is perfect for Nikon F AI Mount Cameras and Lenses. It allows for close-up photography and is compatible with Nikon brand cameras and lenses. This Extension Ring is easy to attach and use, and is a great addition to any photography kit. It is made from high-quality materials and is built to last. Get up close and personal with your subjects with this Nikon PK-11A Auto Extension Ring.