Mbps I would recommend a V90 memory card or faster. Here is Fujifilm's compatibility list for the X-T3: https://fujifilm-x.com/global/support/compatibility/cameras/x-t3/

I bought a X-T3 JUL2022, read the manual 2x, start taking pictures but movies only last 15 seconds. Cards are Samsung 64Gb EVO Plus A1 V10 130Mbps. What's wrong?

Hey what are good ways to clean the evf eye sensor on my GFX 50R (or any fuji model with eye sensor).  It's very hard to get a lens cloth in there and there's not much room to work with.  My camera is keeping the evf active even though I have it set to automatically switch between evf and lcd, I think due to the dust on the evf.  Googling for an answer seems to only tell me how to clean the cameras sensor.

There are lenses without an aperture ring.

In aperture priority - set the lens wide open - choose a scene with objects at different distances - now press the button you have assigned to "PREVIEW DEPTH OF FIELD" and the effect should be obvious.  (I checked it with X-S10 but X-T4 should be much the same - its not something I ever use as half press will do the same and also focus on the subject)