Useful Photography Tip #52: How Aperture Affects Your Flash Exposure: "Your flash and your lens’s aperture are directly correlated. First off, know that your shutter speed generally controls the ambient light in an exposure while your aperture controls your flash’s exposure. ISO controls overall sensitivity in an image. But then your flash’s power varies. Many people use TTL. But if you’re using manual flash output, then consider this: if your flash is fixed at 1/4 output, and you vary your aperture, the flash will either illuminate more or less of the image that your camera captures."
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