Gene Kelly had an umbrella while dancing to “Singin’ in the Rain” but he didn’t use it much, preferring instead to get wet. Photographic umbrellas won’t keep you dry but are the simplest to use and most inexpensive form of lighting modifier available, and that makes them the most popular as well. These umbrellas look and act like the kind of umbrella that keeps “raindrops from falling on your head” except that in a studio lighting situation they are usually reflective and light is bounced into them, creating a big, soft light source that’s directed toward the subject. Sometimes an umbrella is covered with translucent material and instead of mounting the umbrella so light is bounced into it, a light is fired through it, turning it into a direct source. While some light is lost shooting through an umbrella, it produces more direct light, and since more light is being directed at the subject it gives you the ability to shoot at a smaller aperture than when bounced into the umbrella. If you compare the apertures produced in the illustrations you’ll see what I mean.