When I was in school some 50 years ago this was one of my favorite books on the subject of photographic exposure determination. An absolute historical masterpiece. Fourth edition ISBN # 0-85242-762 X. The list of references in the book are worth the price of the book. Out of print but worth the chase. The authors were the developers of the famous S.E.I. 1/2 degree spot photometer. And the best part ?? No zone system stuff 

