DotTune: Video Tutorial for AF tuning without photographs

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

Daniel Lauring wrote:

Nice job, Horshack. Your explanation is easy to follow.

People might want to choose the distance they most use the lens at, vs. the 40 times the focal length, if the tuning varies with distance. Likewise for zoom lenses they might choose their most common zoom range vs. the midrange. Or, they might choose the longest zoom focal length where the affect of miscalibration is the worst.

I agree. I chose 50x in the video just to have a workable solution when using a focus chart. I mention in the 'additional notes' segment of the video that some may need to tune at their intended focus distance if their lens exhibits distance-specific focus anomalies, or to tune at a compromise distance if they shoot at multiple distances. I mention zoom lenses in the same vain.

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