through the 1980s and have called it ISO since then.
Use the lowest ISO that gives you the apertures and shutter speeds you need. Pump up the ISO up to get smaller apertures and faster shutter speeds. Unlike film, digital
For film or
The reason you want the slowest ISO is for lack of noise or graininess. The faster settings often are more grainy than the slower ones.
SummaryThat's it. I have no idea why people make this so complicated. It has very little to do with photography. If you want to spend more time on this any book on basic photography covers it. I prefer the Ansel Adams' book "The Camera" here.
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