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  2. Photography and the law - Wikipedia

    en.wikipedia.org/wiki/Photography_and_the_law

    A sign declaring "No Phototaking" inside a Hong Kong public library. In some public property owned by government, such as law courts, [82] government buildings, libraries, civic centres [83] [84] and some of the museums in Hong Kong, photography is not allowed without permission from the government. It is illegal to equip or take photographs ...

  3. No symbol - Wikipedia

    en.wikipedia.org/wiki/No_symbol

    No symbol. The general prohibition sign, [1] also known informally as the no symbol, ' do not' sign, circle-backslash symbol, nay, interdictory circle, prohibited symbol, don't do it symbol, or universal no, is a red circle with a 45-degree diagonal line inside the circle from upper-left to lower-right. It is typically overlaid on a pictogram ...

  4. History of photography - Wikipedia

    en.wikipedia.org/wiki/History_of_photography

    View from the Window at Le Gras 1826 or 1827, believed to be the earliest surviving camera photograph. [1] Original (left) and colorized reoriented enhancement (right).. The history of photography began with the discovery of two critical principles: The first is camera obscura image projection, the second is the discovery that some substances are visibly altered by exposure to light [2].

  5. f-number - Wikipedia

    en.wikipedia.org/wiki/F-number

    f-number. Diagram of decreasing apertures, that is, increasing f-numbers, in one-stop increments; each aperture has half the light-gathering area of the previous one. An f-number is a measure of the light-gathering ability of an optical system such as a camera lens. It is calculated by dividing the system's focal length by the diameter of the ...

  6. Diane Arbus - Wikipedia

    en.wikipedia.org/wiki/Diane_Arbus

    Alexander Nemerov (nephew) Frank Russek (grandfather) Diane Arbus (/ diːˈæn ˈɑːrbəs /; née Nemerov; March 14, 1923 – July 26, 1971 [2]) was an American photographer. [3][4] She photographed a wide range of subjects including strippers, carnival performers, nudists, people with dwarfism, children, mothers, couples, elderly people, and ...

  7. Photogram - Wikipedia

    en.wikipedia.org/wiki/Photogram

    A photogram of a number of photography-related objects. Photogram with soil and plants. A photogram is a photographic image made without a camera by placing objects directly onto the surface of a light-sensitive material such as photographic paper and then exposing it to light. The usual result is a negative shadow image that shows variations ...