This lens replaces the previous high quality L-series 28-70mm
f/2.8 lens, with a lens of even greater caliber. The range has been extended to
cover an ultra-wide angle of 24mm, which 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.
- Internal Focusing
The internal focusing mechanism allows the front of the lens to remain
stationary and to easily accommodate specialty filters, such as
polarizing filters.
- Two Aspherical Elements
A lens design incorporating elements ground so the curve of the
surface does not describe an arc of a circle. Especially useful in
reducing distortion in wide angle lenses.
- UD Element
UD glass is one of the new technologies to open new possibilities to
develop the zoom lenses with low weight and high optical performance.
UD elements make it possible to correct chromatic aberrations whilst
maintaining low weight.
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