My current method to determine AF-Fine Adjust values

Started Mar 26, 2013 | Discussions thread
OP Kerusker Senior Member • Posts: 1,181
Re: My current method to determine AF-Fine Adjust values

DarylK wrote:


I just gave this a try.  I very much like your general approach/concept.  However, what I did varied a little from the alternative approaches you mentioned.

What I did was do multiple focuses using live view with observation of where the distance scale of the focus ring most consistently stopped relative to a fixed mark on the lens barrel.

Good idea. I left the problem how to focus most accurate in LV to the reader (AF in LV or manual focus in LV). Some lenses may not auto focus very well in LV - then you approach may not be the best. But that's easy to find out.

Then, I tried various fine focus adjustments using PD-AF until I was satisfied I found the right setting that most consistently set focus to that same point.  This method worked on all the lenses I typically carry around except for the 18-135 which doesn't have a focus ring that has distance settings (or moves when focusing for that matter).

Why not use a little adhesive sticker on the focus ring?

Thanks for the tip!

Glad that you tried it and gave your feedback.

I think it's a good method to learn about the AF behavior of a lens easily. And maybe the 'focus shift' and 'fine adjust irritation' problems are getting down to what really happens - at least a bit ;).

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