How can A6000 beat PDAF, doenst make sense?

Started Feb 12, 2014 | Questions thread
EinsteinsGhost Forum Pro • Posts: 11,977
Re: PDAF like the A7.....

EinsteinsGhost wrote:

Actually, PDAF does help NEX-6 although its effectiveness is more limited (and a first generation attempt). The a6000 design may be all new and more effective.

As far as I know, PDAF on NEX-6 is only used to start the AF process, as PDAF tells the camera whether the lens should be focused farther or closer (contrast detection can't tell), thus avoiding some hunting. The NEX-6 completes the auto-focusing with contrast-detection. The A6000 might use PDAF more... in any case, I think we need to know more about this, and see some independent hands-on review.

There are a couple of videos (one by Vogel and another by DanK) that show the a6000 at work and it looks impressive (not everything is shot under bright light conditions either) so it looks very promising. Of course, I would love to see more of such videos including other lenses (the FE 70-200G will be a superb candidate for it as one of its purposes is action photography).

As for the hybrid AF system, that is indeed the typical routine: PDAF to move the lens quickly near focus in one direction, and fine tuning with CDAF.

Speed will of course depend on read out rate, algorithm, the motor's capacity relative to the elements it must move and so on. Another key component to speeding up performance is to build more compact ciruitry (in fact, one of the goals that led to IC development). Yet another may be ability to have several pixels work together (this may be one of the more noticeable improvements and should also emhance performance in low light).

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