If it matters i'm talking about my d40 here. When you guys are swapping between lenses and are out shooting how much attention do you pay to dust? Lets say you are out by the water say the beach or something and you want to swap between your 18-55 to a 55-200. Does it matter that you are on the beach or will you go in your car and swap out? Should i be trippin about this or does it not matter?