Samyang AF 85mm f/1.4 FE: Disable Lens Compensation?

In a test I posted a while back, I demonstrated how the Samyang 85mm f/1.4 made abrupt changes visible on the edges of the frame during continuous autofocus. Till this day, no other filmmaker I’m aware of has written about this type of behavior – until now, that is. During his comparison of three E-mount zooms, Gerald Undone discovered that the soon to-be-released Sigma 24-70mm f/2.8 exhibits the very same jumpiness during focus pulls, which as it turns out, disappears entirely when in-camera lens compensation is disabled. Could that be the reason for the Samyang’s video AF-C performance? Here’s what he has to say about the Sigma (skip ahead to 4:09):

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