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| p.6 #15 · p.6 #15 · Dot-Tune: Autofocus Fine Tuning in under 5 minutes |
I gave this method a try with my Nikkor 85mm ƒ/1.8G. I already have it tuned so I thought it would be a good test. The resulting range where I got an unwavering digital rangefinder "dot" was nearly 75% of the range of adjustments: 11 to -19.
That hardly gives me a sense of confidence.
That said, the center of that range, -4, is only one off of what I had previously determined to be the correct adjustment of -5.
I had less luck applying this technique to my 70-200/4 zoom. The rangefinder inconsistency seemed greater at some focal lengths than others. In fact, at 200mm, the rangefinder thought every single adjustment, 20 to -20 was in focus… not helpful, especially since test photos showed otherwise.
Anyway, that's just my experience with it.