Has anyone encountered a need for AFMA when using adapted lenses?

Started Nov 19, 2018 | Discussions thread
Chris R-UK Forum Pro • Posts: 20,012
Some MILCs include an AFMA capability

My Olympus E-M1.2 and some of the Sony A7 bodies include AFMA.  There may be others.

It would appear that, although mirrorless removes the main cause of front/back focusing - the different light paths in a DSLR between the AF sensor and the image sensor - it apparently doesn't remove all.  Roger Ciccala of Lens Rentals has pointed out that very small misalignments at the lens/body interface can also cause focusing errors.

There have been a number of threads on this issue in the M4/3 forum and a small number of forum members have actually had to use AFMA.  The vast majority, myself included, have never experienced any problem.

In principal CDAF or hybrid CDAF/PDAF should eliminate all errors in single shot focusing, but it would appear that this is not always true.  Does the EOS-R use hybrid focusing or is it pure PDAF?

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Chris R

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Olympus E-M1 Olympus E-M1 II Olympus M.Zuiko Digital ED 9-18mm F4.0-5.6 Panasonic Lumix G 20mm F1.7 ASPH Olympus M.Zuiko Digital 45mm F1.8 +4 more
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