F1 and camera lens

Hey everyone 
I'm heading to Spa for the grand prix in August and I'm looking to buy/hire a better lens. I have an Olympus E600 DSLR with a 18-40mm lens at the moment. We are sitting at Eau Rouge so quite far away from the track. Can anyone suggest a suitable lens for more close up shots? I'd be extremely grateful for any advice or links to sites

I'm heading to Spa for the grand prix in August and I'm looking to buy/hire a better lens. I have an Olympus E600 DSLR with a 18-40mm lens at the moment. We are sitting at Eau Rouge so quite far away from the track. Can anyone suggest a suitable lens for more close up shots? I'd be extremely grateful for any advice or links to sites

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Though I think the olympus equivalent is a little bit more expensive.
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