What Is It With Fuji X and AF Performance?

Started Jan 2, 2013 | Discussions thread
57even
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In reply to Charlesn, Jan 2, 2013

Charlesn wrote:

The Preamble:

Yes, I know that CDAF is never going to be PDAF.

Yes, I know there are various workarounds that will coax better moderate-low light AF performance from the Fuji X cams.

Yes, I know that the more these workarounds are used, the more natural they become, to the point of not seeming like workarounds.

Yes, I know someone will respond to this thread by saying that they only shoot black cats at night in dense fog and never have a problem with Fuji AF.

Okay, that said, why is it that Fuji continues to lag far behind the class leaders in CDAF performance? How is it that Fuji can write software code that borders on magic in terms of IQ, but can't seem to do it for what would seem like the easier task of improving their CDAF? Why is it that two years after the release of the X100, and several cameras later, the #1 complaint about Fuji X cams remains AF performance in moderate-low light?

It is Fuji's first ever interchangeable lens AF camera. It is WAY ahead of any of the first generation MFT cameras and NEX's, and really no worse than some current model/lens combos.

It is a lot better than an EOS M. Or a Sigma DP2, RX1 or G1X.

It's not as good as an EM5. However most MFT lenses are slower and the sensor is smaller, so it has more DOF hence does not need to be as accurate. The lenses are quite a bit smaller as well.

I also have a few screw drive lenses on my D700 which don't focus any faster (old Sigma 105 macro for instance, or the 85 F1.4 (in fact AF-D version is faster than AF-S).

Moreover focus accuracy on the X series is much better than any SLR, in all types of light. Change the light sources (or even just the aperture with fast primes) and PDAF systems will back or front focus like a goon-un.

So I don't accept it's bad, and it's far from unusable. And all things considered it's actually pretty good for a first attempt, and the PDAF system coming in future cameras will make it better still.

But like I said, it's actually NOT that uncompetitive overall.

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