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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:

I think you'll need to post your AF settings, and it'll also be good to post the lens(es) you are using.

I never had any front-focusing or back-focusing issues with my M5 and any lenses (as you describe).

R2

Hi!

Thanks for your reply! 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.

The results were mostly identical with all three lenses.

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?

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.

 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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