Dimsol,
I will mention something that may be very obvious to some but this happen to me. The shutter speed was set on "A" while I was testing my X-T4 in dimm light. I was under the impression that my X-T4 was taking 2 picture, but is was just the shutter opening and closing at 1/4 sec timing.
Is this the case or do you actually have 2 pictures saved on memory card per press ?
The battery was most likely not empty. Also, new battery are faster at charging than older one. And lastly, my X-T4 battery usualy charge in about 1h to 2h.
You may not like the answer, but I would start to look for another body. You can send it to Fujifilm for an estimation but water damage, specially the dirty water of a river, usually means the end for a body.
Asis,
In order to have the focus continuously:
You need to maintain AF-ON
The front MCS dial need to be on AF-C
If it doesn't work, make sure your AF-ON shortcut was not reassigned to another function
I’m using a X-T4 with a manual lens (7 Artisans 60mm Macro)
Focus Check
I use a shortcut button (Fn2) for Focus Check (Red High - Focus Peak Highlight)
The Focus Check shortcut only work when the auto focus dial is on AF-M. Focus Check do not work in AF-C or AF-S. (It would also work by moving the ring of an AF lens)
IS
IS in Continuous mode work in all AF modes. No need to half press or to hold AF-ON but it does consume more energy
IS in Shooting Only mode, works while half press or AF-ON while on AF-C. It does not work on AF-M nor AF-S
Question
I would like to use the Focus Check and IS in Shooting Only mode at the same time. How to do this?