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| p.4 #9 · Strange front-focusing problem with Sigma 35/1.4 |
Well, now I'm even more confused. I just did some testing with FocusTune. Since I already knew the lens was front-focusing, I did an initial test at +5, +10, +15 and +20. It said +15 was the best result with this chart:
So then I did a bunch of shots from +13 through +19. It told me +17 was the best result, with this chart:
I looked at the actual files, though, and +17 was inconsistent and didn't look right. So I ran the test again. This time it returned +14, with +17 as the worst result!
Then I looked at the +14 files. They're all over the map:
I don't know whether this is a camera problem, a lens problem, or both.
What do you think?