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Why the Fujifilm X-H2 Beats X-T4 in AF Tracking despite Having Lower AF Calculation Frequency


Thomas B. Jones and Andreas Jürgensen were in New York and had a press-meeting during the last X summit, where Fujifilm mentioned little tidbits that they did not touch on during the official X summit.

Luckily for us they made a video about it, which you can see in German down below or read summed up in English below.

  • X-H2 and X-H2S are both rated for 500,000 shutter actuations
  • object detection is exactly the same on X-H2S and X-H2, so both cameras recognize objects with the same efficiency, because that’s made possible thanks to the new processor, which is identical in both cameras
  • the real difference between X-H2 and X-H2S lies in the reading of the autofocus information for tracking purpose. When high speed tracking of objects, then you’ll notice a difference in favor of the X-H2s
  • Autofocus Calculation Frequency:
    – X-H2S: 120fps
    – X-H2: 26fps
    – X-T4: 40fps
  • despite the X-H2 having a lower AF calculation frequency, it is anyway better than the X-T4, because of the new AF algorithm that can make predictive calculations on where the subject is going to move
  • that’s why the tracking on X-H2 is superior than X-T4, even if X-H2 makes less AF-calculations
  • X-H2 has more precise AF than X-H2S, as it has more phase detection pixels. In subjects with very fine details, this means that the X-H2 locks on them more precisely (we reported here). But if it was about tracking those subjects, the X-H2S would have again the upper hand.
  • at 26MP you don’t notice if the AF is minimally off, but at 40MP you’d start to notice it. Hence X-H2 has to be even more precise

I found the autofocus part particularly interesting and especially to see how powerful the new AF algorithm is in combination with the new X Processor 5. So much so that it even makes up with smartness for the slower AF calculations on the X-H2.