DotTune: Video Tutorial for AF tuning without photographs

Started Feb 19, 2013 | Discussions thread
Horshack
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Re: DotTune: Video Tutorial for AF tuning without photographs
In reply to JLim22, Feb 28, 2013

JLim22 wrote:

I just did this test with my 6D and Sigma 35... the autofocus was perfect. -9 and 9 was the range.

Now, I did the with my 85 1.8 and all this time, I thought this lens didn't need adjustment. But it's beyond -20. I'm not sure what to do. How do I slightly defocus to bring it in range?

Marianne Oelund came up with the defocusing technique and describes it here. Btw, for your 85mm, what's the other end of the range you're getting?

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