VILTROX DG-C Automatic Extension Tube Set For Canon
(12mm+ 20mm+ 36mm)auto extension tube can be mounted on the camera body between 35mm lens.

One set of  auto extenstion tube is composed by 3 different ring,can be used alone or combined,which can achieve 7different kind of magnification and work perfectly with camera’s auto focus.

These extension tube can be compatible with camera TTL flash and AE mode but cant compose with

 AE set of flash.All the internal contact pins and pads are electroplated in industrial gold ensuring greatest conductivity and fastest auto focusing on long lens.