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I've got the Sigma 120-300 2.8 and so far its been great! Its far cheaper than any other 300 2.8s and also offers a zoom! I find the zoom indispensable for motorsport.
BTW, the Sigma 300 2.8 prime is actually less sharp than the 120-300 2.8, die the the latter being a newer lens. Apparently even Sigma have admitted it.
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