The auto extension tube (12mm + 20mm + 36mm) can be mounted on the camera body between a 35mm lens. A set of auto extension tubes consists of three different rings that can be used alone or in combination to achieve seven different magnifications and work perfectly with the camera's autofocus. This extension tube may be compatible with camera TTL flash and AE mode, but not with the AE set of flash units. All internal contact pins and pads are galvanized in industrial gold, ensuring the highest conductivity and the fastest autofocus with long lenses.

The rings can be used alone or in combination to achieve seven different types of magnifications and work perfectly with the camera's autofocus. The pure copper pin ensures a perfect match, while the metal interface allows for better transmission and is ideal for the camera's autofocus.