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Nikon E-2 extension tube (non-Ai) 14mm with plunger for opening the aperture while focusing, also useful for stopping down newer G lenses and opening or stopping lenses when reverse mounting or on a bellows. Being pre-Ai there are no electrical contacts and no aperture coupling but AF isn't really needed for closeup work and the plunger makes G lenses useable on a bellows which is otherwise not possible to stop down. It reduces the minimum focusing distance on my 300mm f/2.8 Ai from 7-1/2 feet to 5-1/2 feet (not much but helpful for chasing butterflies) and decreases the minimum focus distance on my 20mm f/2.8 from 0.85 feet to about a half inch at about 1:1 magnification. The effect on my 105 macro is not much but there is no added glass as with a teleconverter or closeup lens threaded on the front. It only cost $12.00 and is indestructable. A cheap plastic ring would not be able to hold the huge heavy 300mm f/2.8.