Jerome Marot
Well-known member
Maybe somebody can answer this simple question.
Suppose we have a camera. We set its meter to a given value, say ISO 100, and point it at a uniform and evenly illuminated grey surface, for example a white wall under cloudy skies.
How many photons reach the surface of the sensor when we take a picture (per unit of surface, to make the result independent of sensor size)?
Suppose we have a camera. We set its meter to a given value, say ISO 100, and point it at a uniform and evenly illuminated grey surface, for example a white wall under cloudy skies.
How many photons reach the surface of the sensor when we take a picture (per unit of surface, to make the result independent of sensor size)?