Hi - what is the reflection density of middle grey/zone V. I guess let's assume 18% grey for middle grey for now. Thanks

Just to be clear - you're talking about reflection (paper) density, not transmission (negative) density, right? Thanks

Yes, the math is the same I think... Just to confirm though, I fired up the densitometer and measured the 18% gray card in an old photoguide. It read exactly 0.75

For reference the formula is Reflection Density = log10(incident/reflected) so for 18% it is log10(100/18) Best, Helen