Giz Explains: Why ISO Is 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. » 2/12/10 2:00pm 2/12/10 2:00pm