D7100: In Live View, why does focus square move on its own, with MF lens?

Started 7 months ago | Questions thread
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D7100: In Live View, why does focus square move on its own, with MF lens?
7 months ago

Lens: Zeiss 100mm f2

D7100 settings: Aperture priority, Live View on, & side AF dial is 'M'

Tried moving the red focus to the center of flower.  After doing this, it might hold on the selected spot briefly, but instead locked onto a petal of a flower in the background with concentric yellow squares.

Concentric yellow squares signify facial recognition, which should NOT be active on a manual focus lens?

Have only seen this once today (1st time experimenting w. Live View on this lens), and MF works fine in the viewfinder with this lens.

Any ideas why Live View might try to use AF?

 nkistrup's gear list:nkistrup's gear list
Canon PowerShot G12 Olympus XZ-1 Nikon D7100 Nikon AF-S DX Nikkor 17-55mm f/2.8G ED-IF Carl Zeiss Makro-Planar T* 2/100 +1 more
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Nikon D7100
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