DotTune: Video Tutorial for AF tuning without photographs

Started Feb 18, 2013 | Discussions thread
Kaj E Veteran Member • Posts: 9,333
Re: Problem: Focus changes during procedure

Horshack wrote:

Kaj E wrote:

I tired the procedure, but could not get it to work. Results were all over the place.

It turned out that the problem is that the focus point switches as soon as I switch from Live view. I focus with live view switch to normal view and then back to live view without doing any refocusing in between, and find that the focus in live view is not where I placed it. I tried in silent mode because I thought that the mirror slap may have changed the focus (activated the AF-On). But silent mode did not help.

Hmm, I've never seen this before. You're saying you focused in LV, dropped out of LV, went back into LV and the focus was different, without touching any buttons or the focal ring while you were outside of LV?

Yes. Automatic live view focusing was not very accurate had to do it manually to get it right. Anyhow when I switched out of and back into Live view I needed to do a new manual  focus in live view. But every time I went out and back into live view it needed readjustment.

If so, how much did the focus actually change?

Hard to say,  just needed manual adjustment again.

Because of this several tries to use the DOT process gave wildly different results.

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Kind regards
WSSA member #13
It's about time we started to take photography seriously and treat it as a hobby.- Elliott Erwitt

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