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Mona Lisa, oil on wood panel by Leonardo da Vinci, c. 1503-06; in the Louvre, Paris, France. 77 x 53 cm.
Why Is the Mona Lisa So Famous?
Lusitania sinking, illustration from The War of the Nations (New York), December 31, 1919. World War I, WWI. This image is one of three on the page. (See source file for the other two.)
7 of the World’s Deadliest Shipwrecks
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Dr. Martin Luther King Jr. addresses marchers during his "I Have a Dream" speech at the Lincoln Memorial in Washington. August 28th 1963
Was Martin Luther King, Jr., a Republican or a Democrat?

teleconverter lens

optics

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photographic use

  • sequence of negative–positive process
    In technology of photography: Telephoto lenses

    …lens is interchangeable, an accessory teleconverter lens group can be positioned between the prime lens and the camera. This turns a normal lens into an even more compact telephoto system, which is less costly than a telephoto lens but which reduces the speed of the prime lens and usually impairs…

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