I was wondering if anyone could give me advice, I have just upgraded my Nikon dslr from the 5000'to the d300s and was thinking about a telephoto lens, my main subject area is horse eventing and fighter aircraft, two extremes I know but I have a budget of around £450-£500. Could anyone advise on a lens that may suit my needs for that amount of money or am I barking up the wrong tree. Any help greatly appreciated!