Flicker reduction affects S-AF?

flannelhead

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May 27, 2021
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I was debugging why my E-M1 II focuses slower than E-M5 III with the same lenses. This was true with several M.Zuiko Pro lenses (12-40, 45/1.2, 40-150) in S-AF. Both cameras running the most recent firmware.

Eventually I was forced to reset the E-M1 II to factory settings and make my usual settings one by one, checking the S-AF at each step. Finally came into the conclusion that the choice of C1 -> Flicker reduction -> Anti-Flicker LV has an effect on S-AF even in natural light!

The default setting is Auto. I usually have turned it Off to prevent aperture "rattling" caused by the flicker reduction. However, turning it Off made the S-AF noticeably slower and probably slightly more inaccurate. 50 Hz seems bad as well, 60 Hz roughly as good as Auto. Notice that this test was done mainly in natural light where flicker reduction should be meaningless.

After the observation, I checked the E-M5 III and indeed it had this setting at Auto. When I turned it off, a similar S-AF slowdown was observed.

Has anyone found anything similar? What could be causing this side effect of the anti flicker setting? It could have something to do with internal image processing frame rate (Auto detection could require image data at a higher frame rate and thus also AF could have more data to work with and achieve higher speeds). Another thing I have found is that if the Anti flicker LV is Off, setting the Frame rate (in D2 menu) to High roughly recovers the S-AF speed.
 

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