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Old Dec 10, 2004, 8:46 AM   #3
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The EX from Sigma are their professional series (much like 'L' on Canon). Theses all metal lenses are excellent and should be differentiated from their regular line which compete on cost where some sacrifice are made to achieve a price point... this is no different than lesser Canon lenses

If you look at the Sigma EX macro, they are second to none with their excellent 50mm actually costing more than Canon, and in the 100-300 range they have two excellent zooms which fill the gap in both Canon and Nikon lines:
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