Like other Canon lenses in the non-professional category, this lens doesn’t include a hood. If you find that you’re frequently encountering lens flare or shooting in dusty conditions ...

The taller the column, the better the lens performance ... out of focus areas in an image without any hint of harshness. Flare is generally well suppressed. If very bright light sources are ...

Apochromatic lenses have special lens elements (aspheric, extra-low dispersion etc) to minimize the problem, hence they usually cost more. Flare is one area where very wide lenses are at a ...