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EF-M Adpter: Focus problems

Started Feb 14, 2021 | Questions thread
OP Robert Seetzen New Member • Posts: 13
Re: EF-M Adpter: Focus problems

R2D2 wrote:

Robert Seetzen wrote:

(...) I mostly use a Tamron 18-200mm F3.5-6.3 Di II VC, a Sigma 18-135 F3.8-5.6 Macro and a Sigma 50mm F2.8 Macro. The tests were made with One-Shot, One-Point AF. The AF point was centered, the AF frame size some times small, some times normal.

Thanks for the info (your AF settings are fine). My first thought is that the issue lies with your lenses. Check with the (3rd party) manuf to see if any of them need firmware updates. Canon will of course tell you to use Canon lenses.

Yes, I'm frightened I just fetched the 'wrong' lenses. At least in combination with an M series camera.

The results were mostly identical with all three lenses.

I have a couple of Sigma EF-M lenses which work wonderfully. Highly recommended.

There won't be enough money in my pocket for new (as in fresh from the factory) lenses.  That's why the adapter is so important for me. And there are many excellent, not-to-expensive second hand EF lenses out there.

What I totally don't understand: How can a mirrorless camera with AF evaluation on sensor produce any effect resembling old time back- / front focus problems? I wondered whether there might be some communications problem between camera, adapter and lens?

Good guess. Poor AF performance is the first place that incompatibility issues show up.

It seems so, yes

And now that I think about it: Many of my not-so-sharp (sometimes _really_ soft) pictures were shot with the Tamron when doing landscapes with focus objects well behind the infinity position. But sometimes I noticed that the focus ring was not in infinity position but instead a bit before.

Definitely check with Tamron to see if it needs an update, or if it’s even compatible at all (esp if it’s not the EF-M version). Unfortunately most of the incompatibility issues I’ve read about on this forum are regarding Tamron lenses.

Tried today to get through on their hotline here in Germany, perhaps more luck tomorrow...

Best of luck to you!

R2

Thanks a lot for thoughts and your tips!

 Robert Seetzen's gear list:Robert Seetzen's gear list
Canon EOS 70D Canon EOS M50 Sigma 50mm F2.8 EX DG Macro Canon EF-S 18-135mm F3.5-5.6 IS STM Tamron 18-200mm F3.5-6.3 Di II VC +3 more
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