Enhance the focal strength of your Canon lens with the Savage Macro Art Extension Tube for Canon EF/EF-S Mount AETC. It is compatible with most EF/EF-S series lenses from Canon and boasts a variable extension adjustment rating of 40-56 mm. This accessory is useful for combining three common automatic extension tubes into a single integrated range. It features an all-metal construction that comprises a pure copper bayonet and gold plated contacts. In addition, the Savage extension tube also features an oxidized surface with internal matting.