DotTune: Video Tutorial for AF tuning without photographs

Started Feb 18, 2013 | Discussions thread
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Robin Casady Forum Pro • Posts: 12,898
Re: Why the middle of the range?

Kaj E wrote:

Knowing that the sharp focus is reduced more rapidly from perfect focus in the direction toward the camera than away from it , why do you propose setting the focus at the middle of the acceptable range and not for instance at 1/3 from the closer edge of the range? I would suspect that the green dot goes to blinking more abruptly at the closer focus side. Have not tried your method yet, this is just how I would expect things to behave.

Have you done any test to confirm that the middle of the range corresponds to the best Live view focus?.

Kaj,

We look forward to your testing of your hypothesis.

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Robin Casady
http://www.robincasady.com/Photo/index.html
"The whole problem with the world is that fools and fanatics are always so certain of themselves, and wiser people so full of doubts."
— Bertrand Russell

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