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OM System (formerly Olympus) cameras are a popular choice for photographers who work outside the studio. The Micro Four Thirds sensor format allows for lightweight lens optics that are easier to carry than heftier full-frame glass. The M.Zuiko Digital ED 40-150mm F4.0 Pro ($899.99) is a perfect example—it's a diminutive zoom with telephoto reach and an all-weather construction.
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