a6000 Prime Lenses

Started Aug 16, 2014 | Discussions thread
tomtom50 Veteran Member • Posts: 3,244
Yes, the Sigma has PDAF in the center

I don't know about the Touit. I don't have one.

PDAF is more than flashing little squares (which the Sigma has in the center)

It is how the camera behaves. CDAF shows itself by "shimmering" as the camera passes back and forth over best focus. It shows itself by shimmering every time you acquire focus.

PDAF doesn't jiggle focus the same way. PDAF, if you are in focus, instantly turns green again if you acquire focus without any shimmering.

CDAF, if you are in AF-C, pumps focus like a maniac and cannot track focus well. PDAF does not pump focus and track focus nicely.

So the little green squares are an obvious thing to note, but the camera simply behaves differently in PDAF vs. CDAF. And the Sigma has PDAF behavior in the center and CDAF elsewhere.

You reached a conclusion about what Sigma does or doesn't do based on press releases from another brand. Not so dispositive.

BTW, the Sony 16mm truly cannot do PDAF at all, even in the center.

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