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... not cheap but we must pay for its undoubted L quality
... precise, fast and silent focusing
... light weight
... no vignetting if slim good quality filters are used ( B+W or Hoya Pro 1 )
... no IS ... but the tests in low light or indoors with no speed-light on my Canon 50D ... show crystal clear and sharp images
... what a wonder for landscape and for indoors
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