When film is said to be N-1 or N-2 does this simply mean (Normal minus one stop..etc.)? Also, when one uses a spot meter...is there a quick formula to calculate these exposures..i.e. You meter an EV of 14.5 to 4.5 how do you determine the correct settings for N-1 or N-2?(posted 9336 days ago)Regards, Darrin