You’re Using Your Camera’s Flash Wrong
Truth is, you shouldn’t use the flash at a performance like that anyway. Not at a sports event, not at a school play, not on Broadway, not at fireworks, not at the Olympics — because your camera’s flash is useless beyond about eight feet.
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Yeah, yeah, I know. I’m telling you to turn off the flash when it’s dark out, but to turn on the flash when it’s sunny?
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That’s called a fill flash. Its purpose is to supply a little additional light for the subject to compensate for the overly bright background.