> > well, ISO + TIME + APERTURE are ingredients of EXPOSURE, and that should be all you need to know to start shooting > So depth of field and the way metering

> > well, ISO + TIME + APERTURE are ingredients of EXPOSURE, and that should be all you need to know to start shooting > So depth of field and the way metering actually works aren't important? Well, we can say "everything is important" and there's no sense to number this stuff to infinity. But if you insist: metering is also just a tool, which you can live without (using exposure value tables), knowing how exposure works is the core of photography.