It's enough to make a person question whether knowable testing is possible with such devices.Just reading the list of meter modifications (various filters, baffling) was depressing enough
I'll try to re-read the exposure meter part of Henry's book so the material will be fresh for both of us. One thing to remember is sometimes the variables can create an accumulative effect and sometimes they can cancel each other out. If you have a chance, you might want to check out the thread Is the K-factor Relevant to me or should I Cancel it Out? Around the third page, I begin posting attachments outlining exposure including exposure meters and the variables in the equation for determining K.