January 2009
Beginner
304 pages
7h 52m
English
Content preview from David Pogue's Digital Photography: The Missing ManualBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Adjust the Light Sensitivity (ISO)?
Here's another setting you'll probably use often as a correction to a shot you've already taken: cranking the ISO up or down.
In the film days, ISO (also known as ASA) was a measurement of the light sensitivity of a particular kind of film. You'd buy ISO 100 or 200 film for bright outdoor shoots, and 400 or 800 for low-light situations. But now that you're digital, you don't have to fuss with swapping film rolls in and out; you can change the ISO setting of your camera with the push of a couple of buttons.
Lower ISO settings always produce better photo quality. So the only reason you'd ever want to crank it higher is to prevent blur in low-light shots. See Chapter 5 for a complete discussion.
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