The family of Olympus Zuiko High Grade and Super High Grade lenses are among the best zoom lenses ever made. Originally designed for the Four Thirds format, they now have new life and a new home on the just shipping Olympus OM-D E-M1 due to its use of on-chip Phase Detection autofocus as well as Contrast Detection AF.
These lenses are expensive, but for anyone who wants the best possible glass, yet who values the versatility of zooms, there are none finer.
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The Luminous Landscape – What’s New