Quote Originally Posted by Bill Burk View Post
I think this can be loosely translated... "If we make a spotmeter, then photographers will have to know where to point it."... "and if they point it at a shadow or a highlight, they'll have to know where to set the dial"
It's the different value of the constant P that makes me wonder, but the paper doesn't discuss spot meters any further. BTW, P is a big part of the answer in the thread about the relationship between film speed and the metered exposure point.