In my experience, both with my own photography and looking online, chromatic aberration is usually purple on one end and green on the other. However, I have also seen the same effect with red and cyan, such as in this question.
It occurs to me that these are both sets of complementary colors; indeed, both purple/green and red/cyan are used for anaglyph 3D for that very reason. Does that mean that you could also get a yellow/blue CA? What about the lens determines the colors that are visibly fringed?
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