VILTROX DG-C Auto Focus Macro Extension Tube Set for Canon EOS EF & EF-S Mount 5D2 5D3 5D4 6D 7D 70D T7 T6i T5i It can instead of expensive Close-up lens, with it , I'm sure you don't want to buy another Close-up lens Auto Focus extension tube, designed for for Canon EF/EF-S 35mm lens to shoot at closer distance with higher magnification. With camera of TTL,AE(through-the-lens, automatic exposure)type it gives perfect coupling except when combined with electronic flash AE unit. Combined with 3 tubes in different length: 12mm, 20mm, 36mm, can be used in any combination or individually to obtain the different magnification. With camera of TTL,AE(through-the-lens, automatic exposure)type it gives perfect coupling except when combined with electronic flash AE unit. We don't recommended to combine 2 or 3 rings at same time if the focal length is less than 70mm.the auto focus is easy when mount ONE ring , but difficult for 2 or 3 . we suggest to set your camera in MF .