no matter how much I learn each day, I still find more things to learn. And this time, Google is no help. What does it mean when film recommendations say to shoot at EL400? At first, I thought it was another way of saying ISO, but I see, for example on Cinestill, they say to shoot their 800t at either EL200-1600 or iso 800. When I noticed it there, I started noticing it other places. What does this mean and how is it different from the iso recommendation? Thank you.