I think it's chromatic aberration[1], it's an artefact of the lens. I'd be interested to know why this lens seems to suffer so much from it. [1] https://en.wik

I think it's chromatic aberration[1], it's an artefact of the lens. I'd be interested to know why this lens seems to suffer so much from it. [1] https://en.wikipedia.org/wiki/Chromatic_aberration https://en.wikipedia.org/wiki/Chromatic_aberration Edit: apparently not based on other comments; will leave this here anyway.