The Canon EF 28–70mm 2.8L USM is an

EF mount The EF lens mount is the standard lens mount on the Canon EOS family of SLR film and digital cameras. EF stands for "Electro-Focus": automatic focusing on EF lenses is handled by a dedicated electric motor built into the lens. Mechanically, it i ...

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zoom lens A zoom lens is a mechanical assembly of lens elements for which the focal length (and thus angle of view) can be varied, as opposed to a fixed-focal-length (FFL) lens (see prime lens). A true zoom lens, also called a parfocal lens, is one ...

made by Canon from 1993 to 2002. It was replaced by the 24–70mm 2.8L USM. Among standard zoom lenses, it is known for very good contrast and sharpness and for its extremely low chromatic aberration and barrel distortion. It has a metal body and neutral color rendition. Although discontinued since 2002 it is still a high ranking lens according to DxOMark among Canon zoom lenses and other standard zoom lenses. Like many other zoom lenses, it exhibits some barrel distortion at the wide end of its range. A unique aspect of the 28–70mm 2.8L USM (and 24–70mm 2.8L USM) is that its barrel extends as it zooms toward its shortest focal length. When used with the supplied "petaled" lens hood, which attaches to a non-moving part of the lens, this extension results in a properly matched shade at every angle of view. Most zoom lens hoods are designed for only the widest angle of view, offering progressively inadequate shade at longer focal lengths.

Canon Standard Zoom Series

* Canon EF 28–135mm 3.5–5.6 IS USM * Canon EF 17–40mm 4L USM * Canon EF 24–70mm 2.8L USM * Canon EF 24–105mm 4 IS USM

References

EF28-70mm f/2.8L USM at the Canon Camera Museum

Canon Europe product page

DP Review news report
Canon EF lenses Canon L-Series lenses Products introduced in 1993 {{photography-stub