I've just been experimenting a bit with the follow through focussing feature on my Nikon using the 500mm lens, so this season is the first time I've ever really used the Nikon for trackside shots. I was finding at Silverstone that it would lose focus very easily just as I was taking the photo. Still to see what my Snetterton pics will turn out like - that'll also be the first time I've had a black and white film in for photographing cars.
With the Pentax I've always pre-focussed.
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