EXPLAINED: How the Fujifilm X-H2S Predictive Autofocus Works and Why 20fps Will Give You Higher Accuracy than 40fps

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I see myself in need to share this follow up article to our previous follow up article to this original article.

If you missed the previous episodes, here is an ultra compressed summary:

  • guy gets 61% sharp images at 40fps shooting birds when testing the Fujifilm X-H2s – read here
  • people complain that 61% is not that much, as Sony cameras tested by the same guy get 85-90% accuracy
  • FujiRumors explains that 61% of 40fps results in more sharp images than 85% at 20fps – read here
  • FujiRumors claims that at 20fps the hit rate on X-H2s would be even higher
  • people call me out on this and say:
    – it’s BS: slower frame rates won’t improve accuracy, as the AF calculations speed remains the same (120fps)
    – people say I speak random stuff and ask me to prove it

So let’s get nerdy ;)

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Fujifilm X-Lab X-T5 Edition – Making the Fujifilm X-T5

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Fujifilm managers and engineers sat down together to give us insights on the Fujifilm X-T5 development.

Nothing revolutionary is said, but I grab the occasion to make a recommendation to Fujifilm: please give us an English translated version of your X lab episodes, as using the automatic live google translation is a real pain.

It should not break your bank to do that, dear Fujifilm.

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Fujinon XF56mm f/1.2 R Discontinued at Some Stores

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Some Japanese stores started to mark the Fujinon XF56mm f/1.2 as discontinued, as reported by the Japanese website asobinet.

This really does not come surprising, as last year Fujifilm has update the lens with a new, sharper and weather sealed version, the Fujinon XF56mm f/1.2 R WR.

It’s a lens that many own and I know many love. I have own myself and the fact that I am very happy with it does not really trigger my GAS for the new one.

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

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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

Conclusion:

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!

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