Pompo

i only look at the histogram...

I liked it very much.
 
What I tried was an early beta version, market launch will be in Feb/Mar 2017.
 
Heavy, but good handling.
 
Can't say anything about the viewfinder as it was early beta...

so, since we don’t know yet, what are we talking about?

Thanks for posting the number.
 
I called Fujifilm and spoke to a service tech who seemed pretty knowledgeable and friendly. He said because I can reproduce the issue, it sounds like it has an electrical problem and the camera would have to be sent to Fujifilm to be repaired. He said it's hard to tell without having the camera there, but it could be a loose connection or an electrical board that needs to be replaced. It could also have something to do with the mode selector since it only happens on continuous low. 
 
I have too many jobs booked right now and won't be able to send it back until at least the 15th. The new firmware is hopefully coming out before then so I'll see if that makes a difference first. 

https://www.bhphotovideo.com/c/product/566472-REG/Barber_Tech_EZF19_19_EZ_Flag.html

Thanks Pompo, I did see that when I went searching, but obviously didn't realise that's what it was!
 
Where does "French" come into it?

https://www.bhphotovideo.com/c/product/566472-REG/Barber_Tech_EZF19_19_EZ_Flag.html

Do you mean a hot shoe cover with a French flag on it?

I'm not really sure either.
 
I'm thinking it could be down to high accuracy of the af point/exposure. Case in point, I use the smallest af square and as I tracked, say a face, the af square will hover over say, nose, mouth, eye brow, etc..... That could cause the shift in exposure, even though I personally think it shouldn't make so much difference.
 
The difference between each picture in the burst could be a 1/3rd stop different from the subsequent pic. It could be brighter or darker at random. In a series of 6 shots, maximum difference in exposure is 1/3rd stop. Like a random collection of -1/3, 0, +1/3.
 
I'll probably try to mount the camera on a tripod and test it on a static object. Will update results then.

Perhaps share the outcome to help anybody else?

It's like watching a 10 fps stop motion picture. You'll get used to it after a while. Initially, I ended up watching the motion picture and forgot about tracking the subject after a few bursts...
 
All in all, it tracks exceptionally well. Only anomaly I found which did not really exist (dslr) is the exposure difference between each shot within the burst. They may be about 1/3rd stop difference between shots. It's a little unusual when you view the contact sheets of all the shots.