LETTER OF THE WEEK
ISO issues
I read with interest the article Bob Newman wrote about ISO not being part of exposure (AP 24 January). To my knowledge this is the second time he has written in this vein.
He takes us back 50 years when he started studying photography seriously, but I think he must have forgotten that in those days of film to get the right exposure we used to use an exposure meter. On these meters there was a third setting (apart from aperture and shutter speed) called ASA, DIN, or ISO. To get the correct exposure this setting was read from the film and if the meter didn’t
