Hi All, I've been reading up (i.e., Steve Anchell's book: The Variable Contrast Printing Manual, copyright 1997) on determining the relative printing speed between the filters in my Kodak Polymax filter set (I use PolymaxII paper). I have noticed that there are some wierd differences between the some filters, most notibly between grade 2 and 3 filters; meaning, that there seems to be a much greater difference in the progression of contrast between 2 and 3 than between other grades. So, I'm wondering if any of you have ever performed such a test as he begins to describe on page 45 of that book (if you have it to refer to)? I'm referring to the "Filter Exposure Factor" chart that he recommends for quick exposure calculations when changing between filters. If I'm reading this correctly, then a successful development of that chart will provide me with the means to correctly speed match my filters for the enlarger/light source that I'm using (Omega B-8 with an Aristo cold light, v-54 lamp). If any of you have done this test, is there anything that you can tell me to be careful of, or otherwise help me make sure that I don't waste a lot of paper in the process trying this test. Thanks for any helpful comments.