A fashion shoot with multiple looks and poses depends on lighting staying exactly consistent across the session — solved guide-number math keeps the key light's output predictable as the model moves through different positions.
Flash Power Matrix for Fashion Photography
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A key light with a large softbox sits 2.5m from the model's mark. Solving the matrix for that distance at ISO 100 gives a manual power setting that holds a consistent f/8 exposure across the whole session, as long as the model's position stays close to the marked spot.
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