The effect of lens decentering on phase detect AF

Started Jul 3, 2012 | Discussions thread
goosel Senior Member • Posts: 1,866
Interesting Topic

I've also given this some thought. I do think de centering isn't the cause but perhaps an amplifying factor. Would be strange if several of my lenses including brand new ones were de centered in the same way.

I suspect some form of classical optical aberration is at the heart of the problem. A de centered lens could amplify an aberration.

I went so far as to try and simulate chromatic aberrations added on to targets. Nothing conclusive. I did note that Yellow targets focus a little bit better.

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