Olympus OM-D E-M1 low light auto focus performance

Started Jan 16, 2014 | Questions thread
Timur Born
Timur Born Veteran Member • Posts: 4,769
Re: Olympus OM-D E-M1 low light auto focus performance
1

Parts of what I just added to my "Focusing explained" thread:

- Phase-detection auto-focus for AF-C and Tracking is switched off (to CDAF) when light levels get to low. You can notice this by Live View first getting very choppy while PDAF is trying to catch light by lowering the frame-rate (longer exposure per frame) and then starts running smooth again once PDAF is turned off by the camera.

With Tracking there is the added condition that PDAF is turned off and *stays off* once the Tracking box leaves the area where the PDAF sensors are situated. Another case where the lack of limiting over the tracking boundaries causes problems.

In both cases PDAF can either be reactivated by releasing the shutter and half-pressing again. Or by keeping the image stable for several seconds (about three) until CDAF completely stops micro-hunting.

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