DotTune: Video Tutorial for AF tuning without photographs

Started Feb 18, 2013 | Discussions thread
clarnibass
Senior MemberPosts: 1,286
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Re: DotTune: Video Tutorial for AF tuning without photographs
In reply to Horshack, Feb 21, 2013

Yes, same thing

By the way, I didn't have tons of time yet, but I briefly checked my 85mm lens yesterday. I set up a 3D target with a flat area that was significantly bigger than the focus point. I wanted the front and back objects to show where the focus is etc.

What I found so far is that the range was much bigger. 0 got the confirmation dot. I think -7 still got it (I'll check again later), but on the positive side it got to +20 and still confirmed.

Is it strange that the range was so big? You and others seemed to get smaller ranges. At +20 focus was deifnitely not great, but of course some of the back subjects were in better focus. Is it possible that the front and back subject were too close to the focus point, making the camera think it was in focus. Maybe I should start with a flat target first.

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