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There're now 2 DO "Diffractive Optics" lenses in the line-up. DO lenses aren't better (but slightly worse) than L grade lenses but their major feature is being SUBSTANTIALLY smaller and more light-weight. Unlike L class lenses they've a green ring next to the filter thread. Thanks to a newly developed optical element ("diffractive") the DO lens is about 30% smaller and lighter than comparable standard lenses in its range. Unfortunately the price didn't shrink by a similar factor but increased by about a factor of 2 compared to similar "classic" design. Optically and mechanically the lenses are on L class level. The DO technology is unique to the Canon EOS system.