I never said anything was incorrect (although the speed part is). There are always different ways to approach a problem. I just wanted to emphasis the importance of understanding the variables and how they work together. I have to double check the Kodak version, but Ralph's works fine as long as you accept that Normal has already factored in flare and accept the parameters for which Ralph defines Normal.

I don't have time at the moment to go through you response, but I should be able to take a pass at it this evening.