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Fuji XT4 auto ISO for video

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Hi, I had an XT3 and now I have an XT4 since last year, mostly using it for family video shooting. I am quite knowledgeable in video as a enthusiast user but cannot find the solution to a single issue, which I believe might be Fuji specific. 

I have my XT4 setup for video as follows: optimised movie mode, shutter speed on manual 1/50, 25fps, aperture on manual (aperture changes ruin the video with my 18-55 f28-4 Fuji lens) but ISO on auto. I am more of a run&gun type of shooter and coming from a lot of Sonys, I tend to use some auto settings for convenience, in this case the ISO.

The problem I always have with Fuji is that it is very very sensitive with the auto ISO, its values jump up and down like crazy and ruins the video. Even if I have the same scene, just one person in the frame talking or moving a little, the auto ISO gets crazy all the time, brightening and darkening the image non-stop. On my previous Sony cameras (a6300, a6500) the ISO changes were much more stable and consistent, they were not obvious during shooting.

Is there a setting I am missing or a solution to this and still using ISO on auto? 

Thank you for the help!

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Auto aperture and auto iso "stepping" in video mode are well know issues with XT3 and XT4.

Latest fw mitigated (but not solved) the problem.

Besides, from what you described, issue could also be related to the metering setting. Check if you have set spot and if so, switch to multi or average and test again.

Do let we know.



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Generally, Auto ISO is not recommended for video for the very problem you are having. The solution is to dial in an ISO setting based on the shooting conditions at the time. Sorry if this is not the answer you were hoping for 🙂

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  • Posts

    • Hi, DaveC. Thank you so much for the really valuable information...very much appreciated! On the power off/on, I guess I was being a little too impatient when pressing the shutter. On the auto ISO, I'll definitely give it a try, as that's a pretty important one for me. I have found that the ISO button and joystick pretty easy to reach while looking at the EVF, so maybe there's no reason to reassign the top left dial. With only a little time spent with the X-S10 so far, I have found the AF and image quality outstanding, as you noted. Even with the challenges of learning a new system, it's been fun getting to know my new toy! Again, thank you for responding to my inquiry. Pentax Forums is a valuable source of information for Pentax users, and it's nice to know Fuji X Forum can provide similar advice and support. Cheers!  
    • OK thanks for the reply,  It's seems like a pretty straightforward thing to implement with all the super fast ssd available in the market.  Maybe in the next model..
    • I don't believe it is possible sadly.   But would be great if it was. 
    • Welcome rickc, I too was new to Fuji when I got my X-S10 and 16-80mm last December. It is a great camera and lens combo. Point 1. To wake up the camera just half press the shutter button but keep it pressed for a second or too and it will wake up. When half pressed you will feel the IBIS doing its thing , thats OK, just keep it pressed till it wakes up. Point 2. Set the X-S10 to M mode on the mode dial and you will have aperure on the front dial and shutter speed on the rear dial. Then set the iso to Auto, Press the iso button on the top plate and use the joy stick to scroll down to the auto iso settings. The user manual does explain the auto iso settings quite well (the pdf that is). Note you can also re-assign the top left dial to exposure compensation if you like that as well. I have been using these settings just lately to photograph butterflies at high shutter speeds. I came from using Canon and Nikon cameras and find the image quality is outstanding and hope you continue to enjoy the camera. Best wishes DaveC. 
    • Look for"sportsfinder"
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