I am attempting to fine tune my negative exposure and development, using a spot meter instead of a densitometer. I am following the "Tone to Zone" article (a link to which I think I found at this site). The process makes sense except for one thing: The article states that 1/3 stop difference on the light meter equals .10 density, with .30 = 1 stop. The article goes on to say that the Zone VIII negative used to refine development time should be 1.20 density units above the Zone I negative, or 4 stops less on the light meter since 1.20 density units equal 4 stops. But if the Zone I and Zone VIII negatives were exposed properly, there should be 7, not 4 stops difference between the two. Anyone who can enlighten me will be immediately inserted into my will. Not that my estate will be worth much, but its the thought that counts, right? Thanks in advance.