KIPON start to ship three high quality macro adapters with helicoid for Fuji GFX50 medium format camera, you can use it as a standard adapter, can reach infinity, also can use it as a macro ring, can shorten the close focus distance a lot, bring you flexibility when you do macro photography.
MAMIYA645-GFX Macro with helicoid
PENTAX645-GFX Macro with helicoid
Hasselblad V-GFX Macro with helicoid
The suggest market retailer price is 368USD.
More macro adapters for Fuji GFX50 are under development.
sample photos shoot by those adapters,