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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Zoom Power
When you read the specs for a camera—or read the logos painted on its body—you frequently encounter numbers like "3X" or "10X." This number tells you how many times the camera can magnify a distant image, much like a telescope. Unless there's fine print, it's a measure of optical zoom, the actual amount that the lenses can zoom in (to magnify a subject that's far away).
Then there's digital zoom, which you may also see on the box. Camera makers seem to think that what consumers want most in a digital camera is a powerful digital zoom. "7X!" your camera's box may scream. "10X!" "20X!"
But when a camera uses its digital zoom, it basically blows up the image. The image gets bigger, but its quality deteriorates.
Avoid digital zoom altogether, and base your camera-buying decision on the optical zoom power. That's the zoom that counts.
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