Auto Flash Heads
Today’s flashes have a motorized zoom that uses a fresnel lens to focus the light from the flash. With a telephoto lens, the flash head zooms in to narrow the beam of light and extend the range. When you are using a wide angle lens, the flash head zooms out widening the spread of light. This makes the flash more efficient by only covering the area in the photograph that you are zoomed on. If that is telephoto the beam of light is narrowed and the flashes range is increased. As long as your flash is dedicated to your camera the two will work together. Depending on your camera system, this ability may become disabled when you move the flash head into bounce mode so check your manual.
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