Monopod is what i used at batley national with that comedy-huge lens chris, if you remember, i think you helped me carry the beast..
I think for me, because i generally want to get quite low for the little cars, if i need a static shot i will use a knee like jonathan says.
If you are having problems tho you might just have a too slow shutter speed, im not sure of the "formula" but generally you need a faster shutter speed the longer you are "zoomed in"
so lets say to get a clear shot at 70mm you might need 1/50th and at 300mm (with the same aperture and light) you might need 1/300th or faster.
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