EOS R6 focus guide inaccuracy

Started Nov 16, 2021 | Questions thread
ProfHankD Veteran Member • Posts: 9,454
Re: EOS R6 focus guide inaccuracy

HHaapala wrote:


I recently bought a PK-EOS adapter, and Im now using a Pentax-M 50 1.7 on my EOS R6 with that and the EF-RF adapter. The PK-EF adapter has a focus confirmation chip, meaning it gives the R6 the ability to activate the manual focus guide feature. This uses the on-sensor AF system to help with manual focusing.

But its inaccurate. The focus guide seems to work normally, but when it says focus is nailed its actually backfocused. I have no idea how this is possible, since the focus guide is on-sensor so there is no way a misalignment or such could cause this. It simply just shows up green meaning 100% perfect focus when you're actually focused behind what you're supposed to. It even clashes with the cameras own peaking. Peaking works normally, and when peaking is on top of focus guide, guide says its not hitting focus.

Very interesting!  That really shouldn't be possible with main-sensor PDAF.

My guess is that the focus chip is somehow identifying as an EF lens that needs a correction for focus data it returns to the camera. Is there even a micro focus adjustment on the camera?

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