Greenbunion's suggestion of flash isn't to be disregarded. Buying a big flashgun will be a lot cheaper than buying a 300mm f/2.8 lens, and you can use it for so much more than motorsport too.
Tifosi, the kind of conditions SDPhotography is talking about are really very gloomy indeed. Getting a fast enough shutter speed with a 300mm f/4 lens at ISO 1600 may still be challenging in Northern England in the winter.
Besides, isn't the Sigma 70-300 wide open at f/5.6 at the long end of its zoom?
Duncan
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