Where does 18% Grey Come From? I answer that question.

18% Grey is used throughout video and photography as a reference for nailing exposure. Not many know where it comes from, or exactly why 18%. I take a brief look at the history of human perception of brightness and answer the question 'Why 18%?'

Attributions
Munsell Atlas Cover:
Albert Henry Munsell, Public domain, via Wikimedia Commons
Munsell color system color charts
Smithsonian Libraries and Archives, CC0, via Wikimedia Commons

Links
Munsell Color Atlas
http://archive.org/details/AtlasMunse...
https://munsell.com/color-blog/atlas-...
Canon C100 Support Page including User Manual
https://www.canon.com.au/cameras/eos-...
Munsell Photometer US Patent Office
https://ppubs.uspto.gov/pubwebapp/sta...