DotTune: Video Tutorial for AF tuning without photographs

Started Feb 18, 2013 | Discussions thread
Horshack
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Re: DotTune: Video Tutorial for AF tuning without photographs
In reply to Horshack, Feb 20, 2013

Ugh, correction. left (infinity) in last sentence should read right (infinity). Corrected text:

If a body+lens tunes perfectly at +0 and I establish critical focus, then we get a green dot. If I then change AF tune to +10, I'm telling the camera "you are front focusing and I need to correct it by moving the focus +10 units toward infinity, so reinterpret what you think is perfect focus as actually being -10 tune units of front focus, so that you give me a right-pointing arrow indicating front-focus and I'll know to move the focus ring +10 units toward the right (infinity) before you give me a green dot".

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