Is ISO the New Megapixel ?

"In 1975, the first digital camera took 23 seconds to record a 100-line black-and-white photo onto cassette tape. Today, a Nikon D3s takes photos with 12 million pixels at 1/8000 of a second. And it can see in the dark.

The conventional wisdom is that the romp-stomp-stomp of progress in digital imaging has proceeded on the mostly one-way track of ballooning pixel counts. Which wasn't always a pointless enterprise. I mean, 1.3-megapixel images, like you could take in 1991, aren't very big. The Nikon D1, introduced in 1999, was the digital camera that "replaced film at forward-looking newspapers." It was $5,000 and shot 2.7 megapixel images using a CCD sensor, large enough for many print applications. But still, there was room to grow, and so it did. Now pretty much every (non-phone) camera shoots at least 10-megapixel pictures, with 14 megapixels common even in baseline point-and-shoots. Cheap DSLRs from Canon are now scratching 18MP as standard. Megapixels were an easy-to-swallow specification to pitch in marketing, and became the way normal people assessed camera quality..."- Gizmodo.com
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