Correct ISO Setting

Recently I noticed many young, novice photographers like to set their ISO setting to "Auto"; when I asked why, they cannot give me an answer because to my horror, most of them do not know what ISO is about or for what purpose!

They, without realising that; the right ISO can make your photo and the wrong ISO can ruin it!

Before we go on, fast rewind 35 years to the good old days when I was using film to cover news jobs as a photojournalist.

That time, our standard shoot everything film was the Kodak Tri-X 135-36; which came in ASA 400.