Gear Talk > EOS Bodies - For Stills
Are autofocus issues common for everyone? *UPDATED*
nightbreath:
I have a Canon 7D and few lenses. The issue I’m experiencing for more than 2 years is related to autofocus with fast primes and can be replicated when camera is focusing at a non-contrast area. It doesn't matter what type of focusing / focusing point I use – I hear focus confirmation in the same manner as if camera has focused properly, but when I make the shot I see that it didn’t.
I've run several tests and identified that the lens AF is inconsistent comparing to Live View autofocus, when area in focus has no contrast. When I use lens AF in ~80% shots I'm getting front-focus issue.
Attached are crops from my tests, red square is the focusing point. Could someone confirm that this is normal behavior? Or should I sent my camera to Canon?
P.S. Shots were taken at ISO 800, 1/80 of a second, f/1.2 and f/1.4, using tripod.
smirkypants:
What kind of lens are you using? Have you micro-adjusted it?
neuroanatomist:
--- Quote from: smirkypants on February 11, 2012, 05:14:23 PM ---What kind of lens are you using? Have you micro-adjusted it?
--- End quote ---
I'll see those questions, a raise you what AF mode (one shot or AI focus) and have you changed any AF tracking defaults, and if so, which and to what settings?
neuroanatomist:
Also, what aperture, and did you focus/recompose?
Kernuak:
Which focus mode are you using? Spot, Single point, expanded, zone or all points? Also have you adjusted the tracking sensitivity or is it still at the default setting. The focus modes on the 7D are much more complex than other consumer and semi-pro cameras and it is only the 1D/1Ds series that are more complex. If you don't use the best mode for the job, then it can be erratic, so we need to rule that out as a cause first.
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