When Fuji X system first came into existence, there is very little 3rd party support. With the XF 60mm macro lens only goes to 1:2 magnification and without any 3rd party macro lenses for the X-mount and good usable extension tubes (from Fuji or 3rd parties), the only ways to get to 1:1 magnification is by using close up filters like the Raynox or adapting lenses. I remember reading horror stories of people using poorly made extension tubes which damages their lens mounts and lenses.
So when Fujifilm announced their extension tubes MCEX-11 and MCEX-12 in 2014, it was indeed a fantastic news for Fuji X macro shooters. I owned both of these extension tubes and they are very well built and fit nicely to the the lens mount and the lenses.
You can achieve different magnification depending on which lens you use. Generally speaking extension tubes have greater effect on shorter lenses. Fujifilm has published a guidance chart as seen below. What fujifilm didn’t include in the chart is the effect of combination of both the MCEX-11 and MCEX-16 extension tubes. I often use both of them together to achieve greater than 1:1 magnification.
These extension tubes cost around $100 each. You can get cheaper 3rd party ones but my advice is to stick to Fuji ones. $100 sound like a lot for extension tubes but you get the best quality and it is much cheaper than a macro lens.
Here are some example photos.
XF35/2 with Extension Tubes:
XF56/1.2 with Extension Tubes:
Please check out the other posts in my Fuji X Macro series:
Part 1: x100s + Raynox-250
Part 2: Fujinon 60mm f2.4 with or without Raynox-250
Part 3: Adapted Macro Lens
Part 4: Fujifilm Extension Tube MCEX-11 & MCEX-16
Part 5: Native 1:1 Macro Lens for Fuji (Zeiss)