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Old 24-04-2009, 07:26 AM
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acropolite (Phil)
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Join Date: Feb 2005
Location: Launceston Tasmania
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Roger, if you don't want Image Stabilisation, then the 17-70 Sigma f2.8-4.5 is an excellent choice. The Sigma is IMO close to the L series lenses for performance, and in my experience the 17-70 has less CA than the 24-105L Canon (I had both for a while). I've seen user reports claiming comparable or better performance from the 17-70 with the 17-40L.

The L series Canons may just edge the Sigma out on contrast and flare resistance, although I didn't ever test the two specifically to verify. The Sigma is also has quite a decent Macro capability.
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