Automatic Macro Extension Tube For Canon EOS M

• Maintains the electronic functions of the lens, including auto-focus and auto-exposure• All metal construction and smooth surface for effortless mounting• No optical insert - maintains lens optical quality• Can combine tubes for various macro ratios   It couples perfectly with the camera’s automatic diaphragm. With cameras of TTL, AF( Through the lens automatic exposure) type, it gives perfect coupling except when combined with an electronic flash AE unit. Feature:This automatic macro Extension Tube Set is 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 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. The extension tubes have no optics. They are mounted in between the camera body and lens to