Response to HP5+ Film Testing (strange results) (LONG)

Buy a copy of Ansel Adam's book, The Negative. It has step by step instructions to do what you need in Appendix A. Your problem is trying to match a print to the grey card. What you should be trying to do is get the negative to a density of .1 over blank film. That is how you find your film speed. Keep developer temperature constant. The lowest density will not change that much with changes in time. Once you figure out your exposure index (EI), then you adjust development time to put the highlights were you want. The grey scale won't help as much as a step wedge would.

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