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Photography glossary

Key light

The main light source in a lighting setup.

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Last updated October 03, 2026 · How we calculate · Sources

StingPhotography

Photography, by the numbers. Free calculators and an open-data reference for photographers — every number on this site is computed from published specifications and physics, not guesses.

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© 2026 StingPhotography. Data from Wikipedia & Wikimedia Commons (CC BY-SA), Wikidata (CC0), Lensfun (CC BY-SA), openMVG, GeoNames (CC BY), iNaturalist and ExifTool — see sources. Updated October 2026.

Try “Sony a7 IV”, “golden hour Paris”, “50mm f/1.8”, “fireworks”, “Portra 400”.