I'm going to have to look into the intention of Davis' use of the term, but I am not optimistic. I think you might just be too deeply immersed into BTZS to be able to judge it objectively. Still, I'll be open minded, after all, we are talking about the difficult and confusing subject of photometry. BTW, the Focal Encyclopdia of Photography partially defines Luminance as "the property of a source or surface that most closely correlates with the subjective percept of brightness, which, due to adaptation and contrast effects of the visual system, cannot be used as a reliable measure."
The person who initiated the tread said, "Can someone point me to a resource that might help explain how the CI is determined or perhaps offer a little Densitometery for Dummies..." So far, I have offered a number of reading suggestions including the original paper on the subject written by the people who invented Contrast Index. I've explained how flare should factor in. I've given the poster an equation to determine CI for different LSLRs, and I showed him graphically how it is supposed to work in relation to SLSR, the negative, and the print. I've corrected a long misused method of G-bar (there is no arc). I've given information on the origins and intentions for the different method parameters. In addition, I had a graph comparing CI, G-bar, and the Zone System approach. No offense, but I think I've written more to respond to the original poster than anyone else so far. Jorge, I think you might have been skimming over my posts.
Sandy,
If I misrepresented what you said, I apologize. I got "slope so it can't be developed to a given CI" stuck in my mind and went with it. As for finding a higher EFS when using a method of contrast determination...well that's not possible and has no relevance to contrast determination (as long as there is enough exposure to measure). They are two different methods. One method determines contrast and another speed. Perhaps there was confusion in the way it was written and the way I read it. Terming what you said was gibberish wasn't polite, I just got pissed off by your dismissive attitude from an earlier post. Maybe we should both practice more patience and understanding?
As for the CI / blank film discussion, it's over as far as I'm concerned. What was meant to be a little fun thought got blown way out of control. If it's OK with you, let's make a fresh start of things - mutual respect, civility and all.