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EF-M Adpter: Focus problems

Started Feb 14, 2021 | Questions thread
R2D2 Forum Pro • Posts: 26,530
Re: EF-M Adpter: Focus problems

cr2shooter wrote:

I have the same problem.
- M6 II
- Viltrox EF-M adaptor
- Canon 50mm f1.8 STM
- Camera settings: One Shot AF, AF Method is the square (don’t know its name), - Continuous AF disabled
Sometimes the lens won’t focus correctly when I press the focus button. You can hear the lens being jolted electrically and then the focus indicator beeps but enlarging the image shows it’s not in focus. Yet on other occasions it works perfectly. The Canon EF-M 32mm/1.4 and 22mm/2 work perfectly all the time.

I’ve tried other focus settings like continuous AF but the fault is still there.

I guess you’d have to eliminate that adapter from the equation, and try a genuine Canon adapter. I don’t have the Viltrox adapter, and I sold my EF 50 STM, so I can’t do any testing for you unfortunately.

The Fotodiox Pro adapter (and my Canon adapter) don’t have focus issues, and didn’t with the 50 STM. However the Fotodiox Pro adapter does suffer from the “internal reflection” issue (resulting in flare and veiling glare), so I’d avoid that one.

Maybe someone with your particular combo can jump in here.

R2

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