Another project from the depths of the lah-bor-a-tree on the bayou..... From the intro: "I’ve started getting intrigued with “Spectral Density Curves” for films. Is this topic the missing “secret” for film behavior? Is it the background for the H&D curves that we spend so much time looking at and deriving - inadequately informed - conclusions? Is this the criteria why some films seem so wonderful and others suck? " A look at the 20 35mm films from all of the major companies. Thanks and a tip of the hat to D F Cardwell, whose comments got me thinking. And wondering.