Please help me refresh my memory on Sony's auto focus. I understand the SLT system just fine. But I know the traditional Sony DSLRs have a different auto focus sensor configuration than other DSLR-makers, with the phase detect AF sensor separate from the mirror. My memory is that this allowed the camera to use phase detect AF in Live View. But looking at the camera diagrams I don't see this being possible, because once the mirror is flipped up to expose the sensor, it can't reflect onto the AF sensor anymore. Am I missing something? What is the benefit of Sony's AF sensor placement?



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