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You can use the shutter speed to create various results. In this case, Aaron used a slower shutter speed (1/100th of a second - 1/250th of a second) to capture the aircraft while still allowing the element of blur from the background and moving parts on the aircraft (i.e.: prop blur) and that gives a great effect of motion (and/or speed).Well, I don't understand what the heck Dave is talking about, but I agree with the results!