Thank you so much, Jerryy! The article is very interesting and now I'm confident about the aperture stepping. About the parfocal property, I have information that the first FW releases didn't fix the initial issues (focusing mistakes in zooming), but a following resease solved the problem: I would like to have a confirmation by some actual user of the lens. Very kind of you, Jerryy!!

This review may be able to answer some questions: https://www.dpreview.com/news/3492623346/fujifilm-xf-18-120mm-f4-lm-pz-wr-lens-is-parfocal-weather-sealed-and-will-cost-just-899 The review seems oriented toward using the lens for video work. Note: If you are working outside of Europe, keep 1/60 in mind as a shutter speed. The line frequency is often 60 hz rather than 50hz.

I relize that the XF 18-120 is not cited very often in the forum: I hope that some of the participants can answer my questions. I'm evaluating to get it for travel photography and video with my X-H2s, hoping that it can resolve some of ancient Fuji problems. First. For sake of operational speed in traveling, I would like to avoid manual exposure, fixing the shutter speed (1/50 to have the proper motion blur and to avoid flickering of electric lights) letting the aperture to vary automatically, but with all my lenses (and, for what I know, all the Fuji lenses) when light changes and the iris opens or closes, the exposure steps in a terrible result. Do the XF 18-120 suffer the same problem? Second. Parfocal. Does the XF 18-120 keep the image in focus during zooming? I thank in advance every friend that will answer to my questions.

Fringer adapters are brilliant. I use them on both the X and GFX cameras. 

You're missing some of mine off the list.    X-E2, X-T4 and GFX100s II