filter factor

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"Landing of Columbus" by John Vanderlyn, oil on canvas; commissioned 1836/1837, placed 1847. In the rotunda of the U.S. Capitol, Washington, D.C. 12' x 18' ft. (3.66 m. x 5.49 m.) Christopher Columbus and members of his crew are shown on a beach

5 Unbelievable Facts About Christopher Columbus

William Shakespeare

The Death of Shakespeare

Vietnam War. Operation Georgia. U.S. Marines bombing bunkers and tunnels used by the Viet Cong. May 6, 1966

9 Questions About the Vietnam War Answered

A Factory Interior, watercolor, pen and gray ink, graphite, and white goache on wove paper by unknown artist, c. 1871-91; in the Yale Center for British Art. Industrial Revolution England

Inventors and Inventions of the Industrial Revolution

Computer mapping, woman at early 1990s computer

Timeline of the 1990s

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?

African Americans demonstrating for voting rights in front of the White House as police and others watch, March 12, 1965. One sign reads, "We demand the right to vote everywhere." Voting Rights Act, civil rights.

Timeline of the American Civil Rights Movement

filter factor

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optical filters

In filter
…increase is known as the filter factor. Modern cameras with built-in meters measure the light after the filtration and thus take the decrease in intensity into account.
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