Image by Derek Key on Flickr Regardless of where in the United States you might be, when the fireworks explode over the skies, you can bet that around you, there will be a see of onlookers, cooing in amazement with their iPhones in hand.  Of course, fireworks are one of the hardest things to actually photograph — especially if you don’t have your camera dialed in with the right settings. Because it’s such a challenger, we asked resident lighting expert…