"how to properly translate the exposure settings" I'm afraid you can't :( Normal light meters are sort of neutral, while camera's all their own deviation in their own metering system. Basically a light meter is per defenition more accurate than any internal system (mostly cause internal metering depends on the lenses as well, which might fool the system). Besides, don't forget that your camera's also calculate their own personaly exposure (depending on the structure of the lens) in combination with the film speed. Very trick stuff. Might as well get yourself an old light meter at ebay or something for a $10 or so :)