DotTune: Video Tutorial for AF tuning without photographs

Started Feb 18, 2013 | Discussions thread
Leonard Shepherd
Leonard Shepherd Forum Pro • Posts: 15,515
Re: This guidance is not fully reliable

I find it amazing the number who come up with a suggested calibrating system and ignore Nikon's guidance on what can cause poor auto focus accuracy.

The suggested target is a regular geometric pattern. Page 100 of the D800 instruction book, and also the instructions for every Nikon camera I have owned in the last 13 years, confirm geometric patterns are not always consistent with accurate focus.

Although I have seen nothing official from Nikon, on the Thom Hogan site there is a target which does not have equal geometric spacing which some suggest is used by Nikon. Whether this second target comes from Nikon or not is a secondary issue, the important detail is it avoids possible poor focus accuracy which sometimes occurs when a regular geometric pattern.

With a good autofocus target the video link suggestions are a reasonable starting point. Whether  relying on the autofocus confirmation light for calibrating to the resolution potential of a D800 with an f1.4 lens used wide open at minimum focus is another topic.

What should not be another topic is Nikon's guidance that the suggested autofocus target may not be reliable enough for accurate fine tuning.

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Leonard Shepherd
Many problems turn out to be a lack of intimate knowledge of complex modern camera equipment.

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