Features: The Viltrox DG-GFX 18mm extension tube is specially designed for Fuji G-mount medium format lenses, for Fuji G-mount, GFX medium format cameras, including Fuji GFX50S,GFX50R,GFX100. Can be used in combination with other macro extension tube rings, to meet your requirements for different sharpness. With built-in metal electrical contacts, to ensure the stability of lens motor power supply and information transmission; Aluminium alloy mount, won\'t bring loss of camera and lens. Support camera TTL, AF(auto-focus) function and AE mode, adjustable aperture, can shoot according to actual photometric conditions, very convenient. High quality and compact machining, metal shell, net weight only 129g, super lightweight and portable.