DotTune: Video Tutorial for AF tuning without photographs

Started Feb 19, 2013 | Discussions thread
Horshack
Veteran MemberPosts: 4,444
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Re: DotTune: Video Tutorial for AF tuning without photographs
In reply to cleew, Feb 28, 2013

cleew wrote:

Thanks for the tutorial! Excellent stuff.

So it seems that this would be ideal with fixed focal length lenses. Does the process vary any if one is trying to tune for zooms? It would seem to me that the focus bias could vary across the zoom range.

The process is the same for zooms, except that some lenses demonstrate different ideal tune values at one end of the focal range vs the other, meaning you either have to tune for the focal length you use most or use an averaged tune value that might still give acceptable results. Btw, this is a property of the lens/PDAF system and not unique to any particular AF tuning method.

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