Originally Posted by

**mark**
Thanks for the clarification. The difference plus five means that if I get an EV of say 15 in the shadow and 18 on the highlight then I have an SBR of 8 right?

In the formula for the spot meter what value do I use for N or is it left as a letter? Would it look like this:

18-15=3 so D=3

(7*(3-N))/3

I was not metering a grey card. The shadow I wanted detail in when I first noticed this was under a rock where little rocks were holding it up. I have noticed this on many occasions. the difference between the two meters is only 3 tenths of one stop. When I was playing with the meter this happened again.

Thanks for the help folks. I have found the BTZS book to be a bit complicated. It's times like these when Dyslexia sucks