No lens is optically perfect. In the ideal world, every lens would produce a sharp, undistorted, evenly illuminated image that’s sharp from edge to edge. Some lenses come close, but the fact is that lens designers have to work within the limitations of the laws of physics and the glass materials they have available, and […]
Lateral chromatic aberration
The most common type of chromatic aberration (color fringing) where objects near the edge of the picture have magenta, blue or green 'fringes'. It happens when the lens magnification changes slightly with the wavelength (colour) of the light, so that the alignment of colors starts to shift more and more away from the center of the picture.