Consider also this fact...I happen to have three brands of film cameras, and I get different readings from the meters of each of them pointed at the same 18% grey card. So which would you believe when loaded with a so-called ISO 100 film?! The same issue happens with dSLRs, too. Thge same happens with light meters, too.
Originally Posted by benjiboy
We know that the ISO standard equations for incident meters and for reflected meters both have VARIABLE value 'constants', where the manufacturer of the camera/meter gets to choose the value that they use!
Last edited by wiltw; 10-18-2012 at 09:01 PM. Click to view previous post history.