Sigma 20 60mm f2.8: Chromatic Aberration

Also, you'll notice here that uh there's a little bit of loca, although you only see it at the 20 millimeter range, and that's where you get that color fringing, the foreground and background out of focus areas, and it's hard to get rid of in post.

aspherical lenses to maximise cross-frame sharpness, plus 3 super-low dispersion (SLD) glass lenses to suppress chromatic aberration.

control over color fringing but like many modern lenses for mirrorless cameras, especially those designed with compactness and a lightweight build in mind, it relies.