R2D2
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Forum Pro
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Posts: 26,530
Re: EF-M Adpter: Focus problems
Robert Seetzen wrote:
R2D2 wrote:
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
To me, the Viltrox adapter seems to be almost identical with the one from Canon. Even small details in the detachable tripod adapter are identical. I wonder whether they are manufactured in the same plant.
Anyway, to my best knowledge, the adapters do nothing more than to forward the electrical connectors in a 1:1 manner. So besides some possible production tolerances, any adapter that fits the mechanical EF and EF-M specs should deliver the same results.
Or am I wrong and the EF-M adapters are in fact more than just metal and a few wires?
I'd think that it would be interesting to test the f1.8 not only with a different adapter, but with an SLR, too.
We've learned however that all adapters are not created equal.
There's a separate known (not AF) issue with internal reflections in some adapters, caused by either the internal paint, baffles, or opening. This causes flare and veiling glare (loss of contrast). Here's an earlier thread detailing the issue...
https://www.dpreview.com/forums/thread/4324738#forum-post-64795450
I only use the Canon adapter now.
R2