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Kenkon Auto Extension Tubes are designed to permit a lens to focus closer than its normal set minimum focusing distance. The extension tube set provides an easy way to compose, focus and meter at the brightest, fullest aperture position without having to manually stop down the lens before shooting. In addition, the extension tube set allows for automatic exposure control. Available rings in this set includes 12mm, 20mm and 36mm. The rings may be used individually or in combination.