I’ve dealt with color casts for several years. I think asymmetric color cast is more normal than abnormal. Not sure why, but I think it has more to do with sensor construction than the lens.Exactly what I was trying to demonstrate with my posts. In actual application if performs well enough. I am not even sure that the color cast issue is due to lens misalignment. It is not symmetrical in my case. The strong color cast at the edges appears to be a function of the f4 aperture in this pancake design? Oblique ray angle? Does anybody understand this better?