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As the Democratic Party continues to winnow its field of candidates to challenge President Donald Trump, it's important to remember that the way candidates are covered on TV can influence public opinion. That's become increasingly ...

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Movies featuring heroes with superpowers, such as flight, X-ray vision or extraordinary strength, are all the rage. But while these popular characters are mere flights of fancy, scientists have used nanoparticles to confer ...

Conceptual design ready for PLATO telescope simulator

SRON Netherlands Institute for Space Research designs and builds a space simulator to test and calibrate eight out of twenty-six cameras for ESA's next exoplanet hunter telescope, PLATO. The conceptual design is now complete. ...

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Attaching its head to its tail to form a ring, a 3-millimeter larva of the goldenrod gall midge squeezes some internal fluids into its tail section, swelling it and raising the pressure like an inner tube.

NASA 'optometrists' verify Mars 2020 rover's 20/20 vision

Equipped with visionary science instruments, the Mars 2020 rover underwent an "eye" exam after several cameras were installed on it. The rover contains an armada of imaging capabilities, from wide-angle landscape cameras ...

Lessons of conventional imaging let scientists see around corners

Along with flying and invisibility, high on the list of every child's aspirational superpowers is the ability to see through or around walls or other visual obstacles. That capability is now a big step closer to reality as ...

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Camera

A camera is a device that records images, either as a still photograph or as moving images known as videos or movies. The term comes from the camera obscura (Latin for "dark chamber"), an early mechanism of projecting images where an entire room functioned as a real-time imaging system; the modern camera evolved from the camera obscura.

Cameras may work with the light of the visible spectrum or with other portions of the electromagnetic spectrum. A camera generally consists of an enclosed hollow with an opening (aperture) at one end for light to enter, and a recording or viewing surface for capturing the light at the other end. A majority of cameras have a lens positioned in front of the camera's opening to gather the incoming light and focus all or part of the image on the recording surface. The diameter of the aperture is often controlled by a diaphragm mechanism, but some cameras have a fixed-size aperture.

A typical still camera takes one photo each time the user presses the shutter button. A typical movie camera continuously takes 24 film frames per second as long as the user holds down the shutter button.

This text uses material from Wikipedia, licensed under CC BY-SA