AF tunning what actually happens?????

Started Jan 24, 2014 | Discussions thread
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AZ Steve Regular Member • Posts: 194
Re: To understand better - or maybe worse

The aperture blades, to be sure, are wide open when PDAF occurs.  Marianne contends that the effective light cone used by the AF sensors is stopped down to an effective f/5.6.  It is a very, very different thing!

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