Can Sigma lenses be Micro adjusted to correct focus? (7D)

Started Jan 16, 2010 | Discussions thread
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dbirling Forum Member • Posts: 56
Can Sigma lenses be Micro adjusted to correct focus? (7D)

I am trying to sort out my focus issues, and in testing I was playing with the micro adjustment on both my Sigma lenses (70-200) and (28-70). I tried small adjustment and then finally huge adjustment in either direction (±20) and saw no change in the image.

My 70-200 seems to be decent, though the focus could be tighter which is why I thought a micro adjustment might help. The 28-70 seems erratic, though more often front focuses for me

Does the adjustment work on the sigma lenses, I have searched and found that it should, but is anyone else able to? I made adjustments to my Tokina 12-24 and it seems to be better.
Thanks

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