I am looking for a new lens and want something to give my telephoto shots better quality. I shoot alot of nature, landscape and Macro. I have a 100 2.8 macro and a 50 - 200 right now. I have been looking at these two and am not sure which way to go. If you have any other lens suggestions I will take all I can get.
Thanks!

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But hurry, time is running out!
