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This lens does what many pros thought couldn't be done — it replaces 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. The optics are terrific with two Aspherical elements and a totally new UD glass element. Sealed and gasketed against dust and moisture. A new processing unit makes the AF faster than ever.
