It seems like a lot of people are sold on this lens. I am sold, but I am having a hard time choosing which one. One of my main uses would be shooting watersports from a boat, but I am not sure which one to buy. I have narrowed it down to the Canon 70-200 2.8 or the 4.0IS. I feel like the 2.8 IS might be over kill for me, and my hobbies. Help me justify my decision.
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