I want to shot a pic of my Kodak step wedge thingy. So what should I do, meter the white and the black and determine the SBR from that and adjust the developing accordingly or meter just the Zone 3 part and adjust the exposure for that and develop at what is considered my normal iso. Film is cheap I can always do it both ways but I was wondering what you wold do. And no I don't have a Stoufer (sp) step wedge etc. I hope to make my own using the film I generally use, Efke PL 100.