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as title i have seen 1 or 2 of them on the bay are they any good for some motor sport i was thinking of going back to knockhill soon and was thinking of bidding on 1 or a 70-200 f4L if i can get 1 in my price range as the 50-500 and the 150-500 sigmas are out my price range i could prob get the 170-500 sigma but i am hearing to many bad reports on they are very slow etc