ISO (I.S.O.) is the abbreviation for the International Organization of Standardization, a governing body based in Europe that provides the standards for a wide variety of subjects.
· Concerts – also low in light and often ‘no-flash’ zones
· Art Galleries, Churches etc.- many galleries have rules against using a flash and of course being indoors are not well lit.
· Birthday Parties – blowing out the candles in a dark room can give you a nice moody shot which would be ruined by a bright flash. Increasing the ISO can help capture the scene.
· Shooting night landscapes – maybe you are shooting northern lights or stars.