What do ISO numbers mean?
Ever wondered what the ISO numbers mean on your DSLR? You may know what they do, but what exactly are they? Photo credit: titicatThe ISO numbers on your DSLR are a throwback to film cameras. Specifically, they're a throwback to the film itself. If you take a look at camera film in the shops you'll still see ISO numbers on them. Most I could find seemed to be ISO 200, but there were a few ISO 400 films. What's this all about, though? And how does it relate to your DSLR? ISO numbers relate t...
