I'm using 7D. Just got back the sigma 30 1.4 after calibration in factory last week.
But I find that it's hard to focus on black object when I use single point focus. Is it the problem of calibration or it's normal to have difficult focus on black object?
I also want to ask what should I check after the calibration?
Someone told me that sigma 30 1.4 always has problems on focusing with big aperture, so should I turn to aperture1.4 and check the focus on distance object or near object? better to check outdoor or indoor?
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