A6000 vs. A77ii Continuous AF - Very confused

Started May 14, 2014 | Discussions thread
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sybersitizen
sybersitizen Veteran Member • Posts: 5,624
Re: Why not just ditch the SLT?

bimmerman wrote:

Why don't Sony just use that A6000 image sensor with 179 phase detect sensors on the A77MKII and just get rid of that light sapping semi translucent mirror? Yes, that new AF chip on the A77MKII has 79 PDAF points but it only covers 40% while the on sensor 179 PDAF of the A6000 covers almost the entire frame. So why keep that mirror? Unless there is a big advantage using a separate AF chip. What gives???

Nobody here can tell you with certainty 'why' this is the case. Suffice it to say that A-mount AF (still backwards-compatible to 1985 lenses) is not the same as E-mount AF. If Sony could do it the same way today for A-mount, it would presumably be done the same way today for A-mount.

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