True, but ISO rating is supposed to be a standard. It's not based on "getting plenty of shadow detail". That's a subjective opinion. ISO standards are supposed to be objective. Pretty much every book and article I've read on film testing, from Ansel Adams to [insert your favorite film tester] has reached the conclusion that if you 1/2 the marked ISO rating you'll be about right when it comes to exposure.(posted 8264 days ago)