What is the smallest camber change from zero that the eye can discern?

Just what the title says. I'm curious to know how little the tire camber deviates from 0 before the unaided eye can discern it.
I can see 1/2 deg. for sure. If I were st spend time analyzing it I don't know if I could see 1/4?? But then again, my rear tire camber moved about a 1/4 and if compared it to the other side I could see that it was different from the other side. That is how I found it, walking up from behind and seeing a difference in the two.
 
A trained eye can see 1/4 degree from 0. But it's not "at a glance" it's in operation. Such as watching wheel motion on specific roads/tracks.

Whether one can seen the difference between -2.4 degrees and -2.65 degrees is another story. I might have been able to discern a little more than this in years past, but not now. Mostly from years of tuning open wheel and conventional race cars.
 
If I line up a front tire with a rear one I bet I can easily see the difference.

I easily see lots of negative rear camber in stuff like Mini Coopers and Mazda 3s.
 
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