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Has any one investigated the New lenses from Sigma and Tamron 18-200! I'd recommend you read the review as it highlights the strengths and flaws of both .
from What AP and PM have both said, The Tamron or Sigma are good choices. so they may give a good review to say The Tamron 28-300 as it is The best .
Canon 17-85 IS vs. Tamron 18-200: which beginner travel lens? by Katt B Are Sigma Digital Cameras and/or Sigma lenses comparable to Canon? by Lee Review: Sigma 180/3.5 vs Canon 70-200IS by Edward H (2005-08-17) EF 28-135 IS USM vs Tamron's AF 18-200 mm F/3.5-6.3 XR Di-II LD Aspherical (IF) Macro I might wait until there are more reviews of the 5D, comparing it with the others Think I might wait for KM's imminent 18-200 digital-only lens, though. .
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