Canon EF-S 17–55mm lens instance of lens model
Quality
The 17–55mm is not an L-series lens, but it has two UD (ultra-low dispersion) lens elements, which are largely reserved for L-series lenses, and some say that the 17–55 has comparable image quality to L-series lenses. Some regard the decision to not designate the lens as L-class as marketing-driven, but being EF-S it will not fit on a full-frame body—therefore, at least under current Canon marketing strategy, cannot be labeled L-series.
"The resolution figures are among the very best seen so far for an APS-C standard zoom lens."The build quality is inferior to L-series lenses (plastic body, not magnesium alloy), though superior to the EF-S 17–85mm lens.
type of example of manifestation of representation of