Extension tube for Canon MK-C-AF1-AL

Extension tube for Canon MK-C-AF1-AL.   -AF extension tube set can transform customer's Canon lens into DSLR body.  -Moves lens from film or digital sensor. Closer focus is greater magnification. -Extension tube does not affect image quality as there is no optics inside.  -In comparison, close up filter is often blamed for degrading quality of image.  -This tube set contains three piece tubes of various lengths such as 13/21/31mm, which can be used individually or in any combination to obtain the desired magnification, total 7 various lengths  -These extension tubes are designed with all the circuitry and mechanical coupling to maintain auto focus and TTL auto exposure with most Canon lenses, given there is enough light to activate the cameras AF system properly