Bower Auto Extension Tube Set for Canon EOS 7D, 5D, 60D, 50D, Rebel T3, T3i, T2i, T1i, XS Digital SLR Cameras (SXCAN)

The Auto Extension Tube Set enables the photographer to move in more closely to an object than from its default minimum focusing distance. Getting closer has an effect of magnifying your subject, making it appear larger in the viewfinder and in your images. The auto extension tubes have no optics and are exceptionally useful for macro photography. They enable the photographer to convert almost any Canon lens into a macro lens at a fraction of the cost, while maintaining its original optical quality. Includes three tubes sizes (13mm, 21mm and 31mm) for optimum versatility. The actual magnification effect changes with each specific lens.