I just got hold of Fuji's MCEX-11 (11mm) and MCEX-16 (16mm) Macro Extension Tubes and I wanted to do a quick comparison. Fuji has a table on line with all the information in numbers form about focus distance etc, but photographers are visual beasts. So as I couldn't find much in picture form on line, I thought I would show some examples of what you get from each of them. I have included one with just the lens, one with the 11mm, one with the 16mm and one with both tubes stacked together. All shots were taken with the camera as close to the subject as possible. I basically focused each lens to minimum distance and then moved the camera in until it achieved focus. I have kept the subject the same throughout (my X100S) so that you can get a good idea of what the difference is from lens to lens with each tube. All of these JPGS were shot square in camera (yes, your X camera shoots in square and 16:9 too:o). Please note, the wider lenses (14mm, 18mm & 23mm) worked with the MCEX-11, but the lens touched the X100 before focusing was achieved with the 16mm or both stacked. The 35mm lens went in so close with both tubes attached, that I had to remove the X100S lens hood.
These tubes are more than double the price of the equivalent on Amazon or Ebay, but as this is a one off purchase and because I've read a lot of comments on line about the electrical contacts not working on third party ones, I though it was worth going for the original Fuji tubes. Besides, I sold my 60mm Macro lens when I heard these were coming out as they're smaller and easily stuff in the corner of a camera bag. Built quality is extremely high and the fit is tight (but not too tight). My one gripe is that neither of the tubes come with a case or a bag and as these go between lens and camera, dust is not welcome. I'm storing them in the little cloth bag that came with the X100 lens hood at the moment. I've used the 56mm f1.2, the 35mm f1.4 and the 50-140mm f2.8 for examples here. I think owners of the 56mm will get the most use out of these, as that lens has a poor minimum focus distance. Sop here are the results.
I wanted to confirm that the photos from the 50-140mm f2.8 lens are correct. I had to check the metadata to make sure these were in the right order. I even re-shot them just to be 100% sure. I hope this post has been useful. Use the comments section if you have any questions about these tubes, or if you would like to see a ring shoot ...etc.