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I was wondering if anyone has the problem.
When I shoot subjects that are closer to me (10 feet or less), I realized MA +11 works the best. So I tuned it that way. However, when I shoot a subject that is greater than 10 feet- MA +11 will cause back-focus. At MA 0, the focus is perfect. Is this common? This is quite annoying that I have to change my AF MA at different scenarios.
My problem is that the MA difference is pretty significant, which causes the subject to be really out of focus when the MA is not...Show more →
Your final focal plan is (1/3 DOF +/-1/8*MA_Index*DOF) but your MA_Index is always a constant number regardless to active DOF (function of : aperture, subject distance, etc...).
MAF system does not work well if MA_Index is larger than (+/-) 5. Send camera and lens in for zero MA_Index calibration