Focus Fine Tune

Started May 13, 2014 | Discussions thread
MediaArchivist Senior Member • Posts: 3,550
Yes, and yes

I have it, and I have used it. I used it incorrectly, and then correctly

When I got my first wide aperture lens (f/1.4) I noticed a lot of missed focus shots. I had never used f/1.4 before, being unaccustomed to narrow DoF I simply assumed it was the lens (or camera). I fiddled forever with the micro-adjust and it did not help at all.

Later, I got more used to the narrow DoF and started to get a lot more keepers. Still, for some lenses (more older lenses from the 1980's and 1990's) the AF was a little off. So I revisited micro adjust again, but was much more rigorous. I got a focus test board, the kind with an angled and marked section, and ran carefully controlled tests at various distances. I repeated the tests several times. A few of my lenses have a micro-adjust in place, most of them don't.

If you are going to mess with it, do it right. Confirm that you have a problem and can assign a number to the problem. Some lenses will act differently from MFD than from infinity. Some are a little off, plus or minus, every time— so micro adjust won't help. For those lenses I use focus peaking and if my subject is not peaked when I get focus lock, I refocus.

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