Viltrox DG-C AF Macro Extension Tube Set

Product description We don't recommend combining 2 or 3 rings at the same time if the focal length is less than 70mm. the autofocus is easy when mounting ONE ring, but difficult for 2 or 3. We suggest setting your camera in MF.Please see 5th image, that's my testing data, hope that's helpful for your photograph, if you still have any problems using it, please feel free to contact me, and I will provide technical support, Thanks Can be used alone or combined, which can achieve 7 different kinds of magnification and work perfectly with the camera’s autofocus.Pure copper pin, perfect match.Metal interface, AF, better transmission Can be used alone or combined, perfectly with the camera’s autofocus. Color: BlackSuitable for: Canon EF/EF-S 35mm LensMaterial: Metal & plasticMacro tube size: Approx.6.8 * 7.4cm / 2.7 * 2.9in (D * H) Macro tube weight: 123g / 4.3ozPackage1 * Extension Tube Set (12mm, 20mm & 36mm) 1 * Front Cover 1* rear cover 1 * User Manual(English & Chinese)