Image that you are flying over New York City looking out the window. To keep your hand luggage within the allowance, you have packed on three lenses: a 28 mm lens, a 50 mm lens and a 150 mm lens.
a) You see the Empire State Building sitting within all other skyscrapers. You want to take photograph that concentrated on only the roof of the Empire State building. Which lens would you use and why?
b) You look down at the meal you have just purchased. You're feeling creative and want to take a photo so that the sandwich in the middle of your tray looks large compared to the cup of coffee off to the side. Which lens would you use and why?