Ok. Je ne me rappelle pas de tous les détails.
Tiens, justement ce matin (2 sept 2017), quelqu'un signale sur un autre site et pour le X100F :
I went to use my X100F this morning, and I got a "Focus Error", followed by a groaning/grinding sound.
Of course, what happened was that after I used one of my TC's, I put my JJC filter hood adapter ring back on (with a UV filter), backwards.
The focus mechanism struck the filter, and retracted.
I'll be extra careful moving forward to make sure I don't do that. Ugh!
Hope to god I didn't damage my camera.