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Canon EF 70-200mm f4 IS USM L: You want a medium telephoto lens for your Canon dSLR, something with a constant aperture, solidly built with pro quality, yet light enough to carry on adventure to some far away part of the world. You have looked at the f2.8 models but didn't think you could afford them or...; Tags: Mode 1, Canon Inc., lens, aperture, f4 IS USM L; Product reviews 2008-10-06

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