How things work.

At this link, you can find a neat site that explains how camera sensors and lens optics work together to make pictures. It's very informative, starting from first principles, and there are lots of sliders to manipulate for a very hands-on learning experience. Like a quality children's museum except for grownups and you don't have to worry about snotty little fingers having been all over everything.

Definitely some first rate edutainment.

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