August 11, 2010
Zoom Digital
Zoom Digital
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ZOOM $9.99 "Zoom goes zero to sixty in nothing flat. It's an exciting ride into the future of the world's favorite physical object, the automobile." -Gregg Easterbrook, author of THE PROGRESS PARADOX "Zoom offers a new way to think about cars and energy that's key to understanding the forces shaping business today. It's smart, well-informed and insightful--exactly what one would expect from two of The Economist's best journalists." -Chris Anderson, author of THE LONG TAIL "Zoom puts oil in its sights and squeezes off one telling round after another. Car lovers will see a sunny future with other fuels; OPEC a steadily darkening twilight." -R. James Woolsey, VP, Booz Allen Hamilton; former Director of Central Intelligence "An incisive analysis of the end of the petroleum age, including all its repercussions and opportunities." -Vinod Khosla, Khosla Ventures "Oil is the problem. Cars are the solution." Those two simple sentences by the authors of Zoom define the scope of their illuminating and important book, an examination of a transformation in business and culture that is occurring before our eyes. We are living in the midst of a Great Awakening. People are seeking environmentally-sound alternatives to gas guzzlers. Detroit's reign is over. Oil companies, despite their billion-dollar profits, could be on the brink of extinction if they don't adapt. And citizens, all too aware that these industries have lobbied politicians into gridlock over energy policy, are mobilizing to support leaders who advocate new policies. In Zoom, Iain Carson and Vijay V. Vaitheeswaran, award-winning correspondents for The Economist, show why and how geopolitical and economic forces are compelling the linked industries of oil and autos to change as never before. Drawing on years of industry research-including dozens of interviews with motor and energy executives, top policymakers, and latter-day Fords and Edisons-Carson and Vaitheeswaran explain: -How Toyota became the world's largest automaker through innovation and superior performance. -Why American politicians have, for decades failed to address our energy issues and global warming-and how grassroots movements, along with individual entrepreneurs, innovators, and outsiders, are making real reform possible. -How these Green revolutionaries are creating new products powered by hydrogen, electricity, bio-fuels, and digital technology. As political leaders debate our energy, environmental and economic future, Zoom offers a lucid and visionary portrait of what that future could be. Anyone planning to vote will find compelling truth in its assertions and conclusions. |
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How good is the quality of digital zoom in HD video cameras?
I know that with standard definition cameras, the digital zoom (versus optical zoom) greatly reduces image quality the farther into the zoom you go, but I'm wonder if an HD camera would only reduce to maybe standard definition when getting into digital zoom.
it's a lot like asking which is sweeter, apple or orange? i have tasted some pretty sour varieties of both.
with respect to the ultra cheap cameras, the term "zoom" is really a mis-nomer. the lens is fixed in its position. for these cameras the electrical "zoom" is just a magnifier, using the central portion of the CCD chip. So the 2 x "zoom" has as good a resolution as the optical based on pixel count and the 4 x "zoom" multiplier uses such a slight interpolation as to look nearly as good as well. The only loss when using the electrical zoom is the reduced effectiveness of EIS, but at 4x even a casual consumer shooter should be able to hold the camera steady. So for the Flip and Zi8 class camera, this is a good idea because it improves your ability to frame a proper shot with no real resolution penalty.
for a camera that has an actual zoom, one with continuously variable focal length, the digital "enhancement" mode may not be of any real benefit. yes, the MP imager can be sampled at just the central portion to give a magnification without loss of pixel resolution, but those MP are better used to give effective EIS at 10 or 20x with optical only zoom. what the hell do you expect to be shooting at 320x? you would need a $10,000 support system to hold the camera steady enough to even recognize the subject. 15x with EIS or optical stabilization is about the practical limit of handheld shooting even for a practiced professional.
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