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EF-M Adpter: Focus problems

Started Feb 14, 2021 | Questions thread
TrackDayLT4 Regular Member • Posts: 164
Re: EF-M Adpter: Focus problems
1

ken_in_nh wrote:

Hard to imagine any way front or back focus can happen with mirrorless, especially since the problem in DSLRs is a mechanical one.

My experience with a m6ii is that landscapes always present focus problems since the photo is cluttered and even the spot on mirrorless is huge compared to my former 70D which had a much smaller spot focus point.

Front/back focus is more that just mechanical mirror/sensor alignment in DSLR's. If that was the case a user would just have to dial in the same MFA offset for all lenses. People who do MFA find that most lenses require different Offset's.

Front/Back focus in mirrorless is a combination of mechanical (focus encoder accuracy/consistancy) PDAF focus distance algorithm calculation, firmware, etc.

Even Canon got it wrong on the RF70-200 and had to issue a firmware update to correct front focusing.

https://www.dpreview.com/news/4325215520/canon-issues-firmware-update-to-fix-front-focusing-issues-for-rf-70-200mm-f2-8-lenses

AF on mirrorless cameras is still quite complicated to balance speed vs accuracy requirements.

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