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XF 18 mm f/1.4 massive AF hunting


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I bought myself the 18mm f/1.4 everyone seems to love so much for shooting videos together with my XT30II.

I can see why people love this lens for photography, the picture quality is stunning.

However, I'm experiencing AF hunting of the worst kind and I've already tried a couple of settings other people recommend to get rid of it. But none of it seems to work for me.

What am I shooting:

  • I'm recording myself while playing electric guitar
  • the audio is coming from somewhere else

My setup is as follows:

  • Fuji XT30II with the 18mm f/1.4
  • HDMI out to Elgato USB capture card going into OBS Studio for recording

Here's a summary of my general video settings:

  • 1080p@24fps with 200mbps
  • file format MOV/H.264 LPCM
  • SS at 1/48 manual
  • Aperture on 1.4 open manual
  • ISO manual (depending on the exposure)
  • face detection on with eye auto

Here's some settings I played around with according to multiple other users' recommendations:

  • AF mode: I've tried both multi and area, but it's bad in both cases, area seems to be a tiny notch better.
  • AF-C custom > tracking sensitivity: I tried 0, 2 and 4
  • AF-C custom > AF speed: I tried -5, 0 and +5

Of course I understand that those three settings are connected and I've tried many different combinations. But no success.

I'd be more than happy to get any hint on what else to try.

Thanks in advance.

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