Thats a big fancy lens alright. The big aperture will certainly bring in a lot more light, I use the same lens and it does a good job indoors. the zoom ring is a bit stiff and its quite a heavy lens compared to my previous 80-200 and 70-200 lenses on the nikon.
One problem is the big aperture can make the Depth of field pretty small, thus making it harder to actually get the cars in focus.
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