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Tricky Numbers, or How 61% AF Accuracy on Fujifilm X-H2s are Better than 85% Accuracy on Sony A9


I posted an X-H2s autofocus test made by a German guy specialised in Wildlife photography, and translated it for you here.

The particular thing about his test: he set up a dedicated “bird tracking test track“, which basically allows him to compare the various cameras for bird tracking under comparable conditions.

On his test track, he got the following results for the Fujifilm X-H2s.

  • 30 out of 49 = 61% tack sharp images
  • 33 out of 47 = 70% tack sharp images

Some people were disappointed by those numbers, especially when compared to the 85-90% hit rate of stacked Sony cameras.

But percentage alone is not the whole story. You have to factor in the frames per second into the equation.

So let’s do just that (taking the worst results he got with X-H2s – 61%)

  • Fuji X-H2s: 61% of 40 images per second = 24 sharp images per second
  • Sony A9: 85% of 20 images per second = 17 sharp images per second
  • Sony A1: 90% of 30 images per second = 27 sharp images per second
  • Sony A7IV: 50% of 10 images per second = 5 sharp images


In his test, when every camera is shot at its maximum burst, the X-H2s will give you more sharp images than any other camera, except for the Sony A1.

If you want to get 3 additional sharp images per second (27 instead of 24), then you have to spend $4,000 more and get the very expensive Sony A1.

My take:

I want Fujifilm to beat any other brand in terms of sharp images per second. So I am not happy with the result of the X-H2s. I want a hit rate of 80%+ at 40fps.

And I also want an even smarter autofocus and the camera to match in terms of AF smartness in this case is the new Sony A7rV.

That’s why I am not completely satisfied and I want firmware, Fujifilm… more firmware in 2023!