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.....

RonFrank wrote:

Once again we have a PDAF technology that is similar to the 5R/T/6/A7 that really does not solve the problem. Will this technology work well in low light? No. Is this technology able to compete with a DSLR? No.

When a manufacture develops a technology that works better than the PDAF found in a DSLR we will know it because it will not be disguised with words, rather they will trumpet it to the heavens and pronounce it a DSLR killer because that's what it will be.

Does PDAF work OK for the average consumer? Yes just not for action. Granted you can capture some action, but I think you are lucky to get a 50% in focus rate shooting with a 200mm lens.

But as other posters in this thread has said, what IS the reason on sensor PDAF is slower than PDAF to begin with? Never understood that part. For example my NEX6 has on sensor PDAF but it doesn't improve the speed at all. It's just marketing crap.

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 for why mirror based PDAF has been more effective has to do with maturing of the technology since it was first put in Minolta a7000 back in 1985. It wasn't incredibly fast, IIRC with center spot only, but worked well. It also has to do with larger sensors (although only 70% of light was used, reflected off the mirror).

With digital sensors, one of the limiting factors has been the pixel size itself. It is likely that the new system is combining more of them to work together with very high rate, while receiving 100% of the light.

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