Fotasy Auto Focus Marco Extension Tube (10mm, 16mm, 26mm) for Fujfifilm X Mount Camera X-Pro1 X-E1 This extension tubes are designed to enable a lens to focus closer than its normal set minimum focusing distance. Getting closer has the effect of magnifying your subject (making it appear larger in the viewfinder and in your pictures)They are exceptionally useful for macro photography, enabling you to convert almost any lens into a macro lens at a fraction of the cost while maintaining its original optical quality. Designed with all the circuitry and mechanical coupling to maintain auto focus and auto exposure with Fuji FX mount lenses It comes as a set of 2 tubes of different lengths which singly or in combination on makes it usable in 3 different lengths, 10mm, 16mm, 26mm. Compatible with Fujfifilm X Mount Mount Camera X-Pro1 X-E1 and Fuji X Mount Auto Focus Lens. Also compatible with Manual Lens, but Auto Focus Function will not supported.