DotTune: Video Tutorial for AF tuning without photographs

Started Feb 18, 2013 | Discussions thread
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Robin Casady
Forum ProPosts: 12,898
Re: DotTune: Video Tutorial for AF tuning without photographs
In reply to Orionisf, Feb 23, 2013

Orionisf wrote:

Horshack wrote:

Orionisf wrote:

Tried to fineture one of my lenses.

And it went fine.

Had to adjust the the lens focuspoint to -17, because it did a confirmed focus from -13 to -20.

Then I wondered can it be true.

I took another test without liveview, the good old way.

The result was completely different with a result at +8.

The focus was spot on.

Wonder why?

If you got -20 on one attempt (beyond range) and +8 on another then something isn't right. Which lens and what focus distance?

The lens is Nikon 200-400 F4 VRII from a distance of 10 meters and the focus is spot on no matter if it's 2 or 50 meters with the good old ajustment.

Did you use AF in Live View? It is not always accurate. If you don't get perfect focus in Live View, the Dot method will be off.

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Robin Casady
"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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