Fujifilm MCEX-18G WR Macro Extension Tube Shortens minimum focusing distance of the lens. Also maintains autofocus and auto exposure functionality Compatible with GFX100, GFX 50 R, GFX 50S Focal Length: 18mm Get up close and personal with subjects using MCEX-18G Macro Extension Tube on any GFX system camera. The extension tube fits between the camera and lens providing additional magnification by reducing the minimum focusing distance.