I use electronic first curtain - full mechanical is vulnerable to shutter shock, fully electronic has rolling shutter and loses a bit of dynamic range (not much, but one reason to shoot the GFX 100s is the extraordinary DR). Electronic first curtain takes care of both...
Following this thread closely. Seems like I really should actually read my manual when I get new toys, but the problem is, the manual doesn't explain things like this typically. Although after research I'm not sure this is correct (
https://www.dpreview.com/forums/thread/4456368) but, I've changed my settings to EFC regardless just to be safe.
So, practically speaking, I simply cannot tripod up and focus stack in the field, much of the time. Angles don't permit, wind is too strong, and time doesn't permit when you need to cover miles every day back country. So for me, I'm getting at most (3-4) focus stacks and dealing with some "issues" in post where 100% of the shot isn't perfect focus. The reality of true landscape photography is that 64 shots is impossible, and inconceivable for about 20 reasons, but the primary being that if shot each scene that way I'd need a 12TB drive after each trip, I'd need a year to process all the images, and I'd need all the leaves to stand perfectly still on the trees...
For me, the best compromise is to shoot just a few shots for focus stacking around f11 if possible (not taking into account night landscape photography here) and try to shoot foreground, mid and infinity in 2-3 shots. I do this manually because the in camera function is too slow (unlike the cannon r5 which has best in class hand held focus stacking software currently). The r5 I always use the auto feature. However, I probably should have used the auto feature on my fuji because when I'm hand holding shots, I lose exact location as I pick different parts of the scene to focus on depending on how near far my subjects are. Also I found that the in camera wasn't reaching infinity for me, which is absolutely CRITICAL, so the software is simply unusable for me. If I set the setting to (3) shots, I want midway through nearground, midway through middle ground, and infinity for my focus stack, and I can really only do that manually. The camera just tries to go near to far based on the settings, and if you don't set them large enough it never reaches infinity. Unless I'm doing something wrong. This is completely different in the r5, which nails it almost every time.
<Example attached of 3 shot stack, and a 4th for blown highlights at infinity - shot in JPG on accident... so shadows are crushed>