Hey all, Got a rather schoolboy question but it's been something on my mind for a while as I try and improve my metering methods and get better exposure. Shooting black and white negatives - I (spot) meter for the darkest part of the scene I still want to see detail in, which will sit in zone 3. That's fine. And then I understand I need to get a reading of the highlights so I can use this information when I develop the negative and make any adjustments necessary. If I meter for the shadows and get a reading of say f/16 at 2 seconds and then to put this into zone 3, this works out to f/16 at 0.5 seconds. I then meter for the highlights and get a reading of f/16 at 1/250 second. To then get the scene brightness range, I have my reading for the shadows and reading for the highlights. However! For the shadows, am I using the reading the meter gave me or the value I'm working with to put the shadows in zone 3? Ie. am I using the 9 stop difference between the metered readings (f/16 at 2 seconds to f/16 at 1/250) or the calculated 7 stop difference (f/16 at 0.5 seconds to f/16 at 1/250) to get my scene brightness range? Thanks very much!