(Revised)Here are some facts you should know about PDAF in 3rd Gen NEX.

Started Oct 21, 2012 | Discussions thread
privater
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Re: (Revised)Here are some facts you should know about PDAF in 3rd Gen NEX.
In reply to Cheng Bao, Oct 26, 2012

Cheng Bao wrote:

I just did some test on my nex-5n

I use A mode, set aperture to F25 on an 18-55 kit lens.

With LCD Display: Setting Effects On

The iris is shrink to minimal during live view, when I half press the shutter, the iris wide open, (to focus I guess) then back to minimal.

With LCD Display: Setting Effects Off

The iris is wide open during live view, when I half press the shutter, the iris shrink to minimal if I keep shutter half-pressed (after focus I suppose).

And the AF performance difference is negligible.

So I wonder why nex-5r and 6 can't make the procedure just like nex-5n?

when you half-press shutter to AF, camera open up the aperture to focus, then shrink it back.

You still get DOF preview and PDAF in same time.

Interesting finding, the 5R DO have a difference than previous NEXs.

My NEX-7 have the exactly same focus method as you described when coupled with the same lenses. I used to put 24z on my NEX-7, when I set a aperture smaller than f/1.8, and half press the shutter, I will hear a click noise for the aperture iris movement, but same methodology doesn't apply to 5R.

Maybe it's the way Sony used to balance hybrid AF system. And Maybe the reason behind f/6.3 aperture limitation is not what I thought in my original thread.

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