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Does Canon 6D MFA work for 35/1.4 ART?

Started 4 months ago | Discussions thread
GammyKnee Contributing Member • Posts: 985
Re: Does Canon 6D MFA work for 35/1.4 ART?

My experience with Sigma - prior to going mirrorless - was not inconsistency as such, but rather the need for different focus adjustment at different subject distances. This is exactly what Sigma's AF tuning software and the lens dock were intended to mitigate; in an ideal world you would set distance-relative adjustments via Sigma's own system and leave the in-camera MFA at 0. However neither MFA nor Sigma's own AF adjustments will work if a lens does not focus (or mis-focus) consistently, and I believe the people who reported this very problem.

If I were buying a used Siggie Art for a conventional DSLR I'd probably take 3-5 wide-open photos of the same subject at key distances (close, a few feet away, and far enough away to count as inifinity), refocusing for each shot. If most photos look sharp enough, or are just off focus in the same direction, that's fine. If there's variation between the distance groups but each group appears consistent within itself, then assume you'll need the dock to get things right. If the focus is all over the place with no obvious pattern, well skip that lens for sure.

Hope that helps.

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