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What are you going to use it for? On that big of a zoom range, the quality is going to suffer quite a bit, sharpness is not very good, and 5.6 @ 300 you are going to need quite a bit of light for a good picture. Artifacts are very definite. IMO, I am a big fan of primes and the L series of cannon. the 24 -105 is OK and the 24 -70 2.8 is great. Get two zooms and an extender if you really need that range. 24-70 and 70 - 200 would be a great combination.
Sorry that I got carried away a bit, but I was never a fan of extended range cheap zooms. But like I said, it all depends on what you are going to use it for.
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