CHG_CANON wrote:
That's what extension tubes do ... They're nothing but tubes of empty air and no brand's air is better than anyone else's. As long as they pass focus & aperture control electronically between the camera and lens, you can't do better. You can only use them better, such as adjusting the lens aperture, focusing via the LiveView on DSLRs or the 10x zoom in the MILC EVF, and assuring a bright exposure in the image.