Response to rating film

Film ratings depend on many factors. You need to find your "system speed" this is explained in a very good publication in the "Kodak Workshop Series" titled "Advanced Black-and-White Photography" (KW19). I recommend this book. I was inactive in photography for several years and this publication was the perfect refresher.If you are just starting out I suggest you look into the other books in the series as well. To answer your question, I regularly rate my 400 Delta at 320 and give it a 20% pull in the developer. This is, however, a personal preference. I use a condenser enlarger that works best with a slighty denser, less contrasty neg. My negatives usually print under a no.2 1/2 polymax filter. The other EI ratings mentioned in your question seem about right for my system as well (with the 20% dev. pull). Good Luck. RO

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