Zoooom!

There were some Karts whizzing round the Three Sisters Circuit this afternoon, and although I'd nipped up to use my new 70-300mm zoom again (with x2 Converter) for wildlife images, I couldn't resist a few shots of the colour and speed!
As well as images taken at 1/2000sec to completely freeze the action, I had a quick try at 'panning', using 1/125sec to get some background blur.