Reading along in Canon's History Hall when I came across this gem of a quote:
Constant improvement efforts have also been made to Canon EF lenses - interchangeable AF lenses for SLRs. In 2001, Canon released the EF400mm F4 DO IS USM, the first zoom lens ever to use newly developed, multi-layer diffractive optical (DO) elements. The most outstanding character of a DO lens is its ability to rigorously correct chromatic aberrations normally associated with refractors under idealistic conditions and deliver sharp and clear images with high levels of resolution and contrast.
Seems pretty ok? Let me make it a bit more clear:
...Canon released the EF400mm F4 DO IS USM, the first zoom lens ever to use...
They forgot to mention that they also made the first 1x zoom lens... Look at this lens we just made, it's a zoom lens! The zoom ranges in focal length from a 400mm telephoto all the way down to a jaw-dropping 400mm! The sharpness is on par with even the most advanced prime lenses, but with a 1x focal zoom range!
Truly inspirational stuff.