I was reading the technical data on Ilford Delta 3200 film. See: https://www.ilfordphoto.com/amfile/file/download/file/1913/product/682/ It says the film's EI is 3200, yet its ISO is 1000. Why the big difference? What the heck ISO should I use? Forgive my ignorance, but I'm getting old and my brain doesn't work like it used to. Hmm... I'll say...!