A flash's power rating: distance (m) × f-number at ISO 100. A GN of 36 lights a subject at 9 m at f/4.
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Last updated October 03, 2026 · How we calculate · Sources
Photography glossary
Photography glossary
A flash's power rating: distance (m) × f-number at ISO 100. A GN of 36 lights a subject at 9 m at f/4.
Last updated October 03, 2026 · How we calculate · Sources
Try “Sony a7 IV”, “golden hour Paris”, “50mm f/1.8”, “fireworks”, “Portra 400”.