This new lens does what many pros thought couldn't be done - replace
the previous L-series 28-70 f/2.8 lens with something even better.
Extended coverage to an ultra-wide-angle 24mm makes it ideal for digital
as well as film shooters, and the optics are even better than before
with two Aspherical elements and a totally new UD glass element. It's
now sealed and gasketed against dust and moisture, and a new processing
unit makes the AF faster than ever.