How can A6000 beat PDAF, doenst make sense?

Started 7 months ago | Questions thread
captura
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Re: No mirror blackout
In reply to Bart Hickman, 7 months ago

Bart Hickman wrote:

dpyy wrote:

How can A6000 beat PDAF? Can someone explain the technology behind this? It doesn't matter how many points of autofocus they put on the sensor it should still be significantly slower than dedicated sensors?

The dedicated sensor may well be able to determine a focus point quicker, but it has to cope with the mirror blackout. If a subject is moving, the SLR must calculate where it thinks the subject will be when the picture gets taken perhaps 0.1s after the last AF measurement was made and then "catch up" once the mirror flips back up to try to reacquire the subject. Predictive AF is usually only available on the higher-end DSLR's.

With the PDAF on the sensor, the camera can continue focusing with no interruptions. No need (or much less need) for predictive AF.

It was only a matter of time before camera processors got fast enough to take advantage of the lack of mirror blackout.

Bart

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But in order to overcome these difficulties, Canon is trying new things with their DSLR, hence the dual pixel technology.

Canon develops new Dual Pixel CMOS AF technology for significantly improved autofocus performance during Live View shooting and when shooting movies

http://www.canon.com/news/2013/jul02e.html

Canon 70D with dual-pixel CMOS AF: The first DSLR that can autofocus videos

http://www.extremetech.com/electronics/160232-canon-70d-with-dual-pixel-cmos-af-the-first-dslr-that-can-autofocus-videos

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