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Try to find out which focal length you use the most and make that the calibrated length.
This, everything else is just a compromise. FWIW in the last 2 years ~180,000 clicks on a total
of 6 D7K's used with 9 lenses....ZERO AF fine tune on any Lucky? I don't really think so. Took
the time to learn the camera like the back of my hand. BTW, 'monkey settings for a beer via PP
Well trust me... this Sigma is back focusing severely. It's the most pronounced in low light. I hate this friggin lens. Worst decision I ever made was trading my Nikon off for this one and the 80-200. HATE this Sigma lens. Its jumpy, it back focuses, and its just not as quick as my Nikon was. I can't wait until after the first of the year when I can buy another Nikon.
I haven't noticed as much of an issue with the 80-200, but what I have noticed may be (as previously stated) the issue of higher resolution and more pronounced camera shake. I use a single focus point. I've tried to use a multi-point focus as you suggested - like the 9 pt, but I can't get used to it. I don't like when I go to focus on something and it hits something just behind it, or just to the side of it, or on top of it - and I have to keep hitting my rear focus button trying to get it to focus on the right thing. I've always used a single focus point on my D90 and never had an issue, ever.