EXTENSION RING E2 This convenient close-up device is inserted between the camera body and lens, adding an extension of 14mm. It accepts any Nikkor lens from 20mm and up. When used with Auto lenses, the built-in plunger is depressed to open the lens to full diaphragm for viewing and focusing. Releasing the plunger stops down the lens to the taking diaphragm. The plunger accepts a Nikon Cable Release.