Whatever it is you want to know about cellphone camera sensors, you’ll probably find it in DP Review’s absurdly in-depth article on the subject. It details not only the common misconceptions about megapixels, but also many real world differences. And it contains the diagram shown at the top of this post, showing the size differences between the sensors in various phones, measured in pixels.
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BARCELONA, MOBILE WORLD CONGRESS 2012 — Yesterday, Nokia announced its crazy new 41 megapixel camera phone, the PureView 808, and the world chuckled. Just how big is the damn phone, I wondered, when Cult of Mac Deputy Editor John Brownlee woke me up and told me the news. But last night I spoke to a Nokia engineer, and it turns out this camera is pretty smart after all.
First, while the sensor does indeed contain 41 megapixels, it doesn’t snap 41MP photos. Instead, the sea of noisy data collected from those pixels is combined in software to get 5MP photos. Why? It started with the desire to design a better zoom.