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Title: Senate Square, St. Petersburg, December 14, 1825: repression of the troop mutiny - watercolor by Carl Ivanovitch Kollman, 1825 depicts Decembrist uprising clashing with cavalry, with spectators watching. (new style December 26, 1825) Europe. Saint

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American bison (Bison bison) also known as buffalo or plains buffalo on the prairie, western U.S.

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Leonardo da Vinci (1452-1519), Italian Renaissance painter from Florence. Engraving by Cosomo Colombini (d. 1812) after a Leonardo self portrait. Ca. 1500.

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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.

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Cheetah (Acinonyx jubatus) standing on rock, side view, Masai Mara National Reserve, Kenya

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acutance

photography

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film performance

In technology of photography: Resolving power and acutance
…measured physically to give an acutance value, which is preferred to resolving power as a criterion of a film’s sharpness performance. Fine-grain films with thin emulsions yield the highest acutance.
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