What Are Megapixels and How Many Do You Need?

It’s impossible to read about cameras and not encounter the terms “pixels” and “megapixels.” Nowadays most cameras have 20 megapixels (MP) or more, and there are some monstrosities with 100MP. I still have memories of walking into camera shops as a teenager and seeing the higher end models having 2 megapixels, and probably in fifty years everyone will have 600MP. So what is a pixel, and how many do you need?

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