Viltrox DG-GFX 45mm Extension tube is specially developed for the Fuji GFX-mount med-format cameras FUJIFILM GFX50S/GFX50R.Can be used alone or combined with other 18mm extension tube, which can achieve 3 different kind of magnification and workperfectly with camera’s auto focus.Pure cupper pin, perfect match. Metal interface, AF, better transmis