How can A6000 beat PDAF, doenst make sense?

Started Feb 12, 2014 | Questions thread
captura Forum Pro • Posts: 25,570
Re: How can A6000 beat PDAF, doenst make sense?

tomtom50 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 a6000 doesn't beat PDAF. It is PDAF, on-sensor.

It is essentially a system introduced by Sony with the NEX-5R, and employs both phase detection pixels on the sensor, and contrast detection to achieve fast autofocus; hence the term, 'hybrid.'

Here is a short description, from Steve's Digicams:

"This new model contains a host of new features, including a new Hybrid Autofocus System that uses 99 phase-detection AF points arrayed on the image sensor to detect a subject's distance and quickly lock focus on it, and then uses contrast-detection AF to confirm extremely fine, precise details.

The new Hybrid AF design allows users to track rapidly moving subjects via Phase Detect AF, as you would normally find in a dSLR model versus a Mirrorless Compact Camera. Sony is not the only one to integrate the Phase Detect AF Sensors into the main Imaging Sensor, so that no separate AF Sensor is needed to provide faster Focus. This is similar to the Hybrid AF technology we saw introduced in Nikon's 1 Series cameras, like the recently announced J2, which has 73 AF points on the main imaging sensor used for Phase Detect AF.

In Speed Priority Continuous Shooting Mode, the Sony NEX-5R switches to Phase Detect AF Tracking automatically using it's 99 AF points to maintain accurate focus on a subject while taking photos at up to 10 frames per second. That's the kind of performance you normally see from a high end Professional Grade dSLR, not from a smaller Compact Camera model like the NEX-5R. The evolution of technology we're seeing in newer cameras like this is amazing."

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