Exposing and metering negative film is important, true. But exposing and metering slide film is critical. It’s also called positive, transparency or reversal film, but it’s more known as slide film. It is simply beautiful. I don’t know how to explain it better than that. I just get amazed when I grab some developed slide film and put it on a light table. You see each photo exactly the way you saw it when you took the photo. The colors and sharpness are simply amazing. And the grain is almost nonexistent. This all is true if you expose it properly. And that’s when it gets tricky.