Dg Gfx 18mm Extension tube is for Fuji Camera and Gfx mount lenses . It has built-in gold plated electronic contacts , the bayonet is made of metal, and the surface is plated which is durable . Auto focus and can be combined with the camera's automatic zoom perfectly.In-built Metal Contactsbayonets are made of mental with surface plating treatment sturdy and endurable.Auto focusSupport camera Ttl features and Ae mode for Fujifilm Gfx mount.Insect close shootFor insect close shoot even the tiny legs and transparent wings can be clearly focused on pictures.