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My view is this: This is a heavy lens and one you might not want to hand hold for too long a stretch at a time. IS would be great if you did though. I see this lens a candidate for tripod shots and that really negates IS. You have to ask yourself not what you are going to use it for, but how you intend using it. If mainly from a tripod save your money and buy the non IS. If your intention is to hand hold this lens then you will certainly need IS in my opinion.
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