Pathé Posograph light meter

A photo of an early light exposure device. A white board with a silver frame sits next to a mahogony case.
https://www.nfsa.gov.au/sites/default/files/2025-07/Image-Path%C3%A9-Posograph-light-meter%2C-no-image-712136.jpg
Title:
Pathé Posograph light meter
NFSA ID
712136
Year
1920
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The size of an iPhone, this Pathé Posograph light meter was one of the first devices created to calculate the aperture and exposure time, which assisted with taking a photograph or exposing film stock.