So you're basically using the meter to get the right reading for a specific part of the image/subject and then checking other elements are within the exposure latitude of the film?
Briefly, yes.
You'll pick up either of those books I mentioned on Abe or Amazon for a couple of quid and even if you don't use a spot meter they are worth a read.
Briefly, yes.
You'll pick up either of those books I mentioned on Abe or Amazon for a couple of quid and even if you don't use a spot meter they are worth a read.