Phase detect AF video - I still don't get the "why".

Started Jul 9, 2012 | Discussions thread
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Shield3
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Phase detect AF video - I still don't get the "why".
Jul 9, 2012

As you all know, if I stick a lens that opens up to F/1.4 and want to shoot AF video, it's limited to F/3.5. Not only can I not go down to F/1.4, but I cannot set it to F/5.6 or F/8 either and get AF.

Before you say "it's a limitation of the phase detect AF sensor" then WHY can I rattle of 12FPS (still mode) of AF goodness @ F/1.4 or F/5.6 using phase detect?
This is still using phase detect AF!

Confused,
Shawn

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