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The ASA scale is a linear scale, that is, a film denoted as having a film speed of 200 ASA is twice as fast as a film with 100 ASA. The ASA standard underwent a major revision in 1960 with ASA PH2.5-1960, when the method to determine film speed was refined and previously applied safety factors against under-exposure were abandoned, effectively ...
The sensitivity of a (digital or film) imaging system is typically described in the terms of the signal level that yields a threshold level of SNR. Industry standards define sensitivity in terms of the ISO film speed equivalent, using SNR thresholds (at average scene luminance) of 40:1 for "excellent" image quality and 10:1 for "acceptable ...
The implied value (1/3.125) for the speed scaling constant given in the Exif 2.2 specification ("Exif 2.2"; JEITA 2002) differs slightly from the APEX value of / (0.2973); with the Exif value, an ISO arithmetic film speed of 100 corresponds exactly to a speed value [3] of 5.
Julius Scheiner (25 November 1858 – 20 December 1913) was a German astronomer, born in Cologne and educated at Bonn. He became assistant at the astrophysical observatory in Potsdam in 1887 and its observer in chief in 1898, three years after his appointment to the chair of astrophysics in the University of Berlin .
The telerecording film chain can be arranged to produce a direct negative-image film recording, a direct positive-image film recording, or a positive print can be made from the negative. In the first two cases we have the following four units in which local gamma or effective image contrast may be adjusted: The recording channel amplifier.
Archived at Ghostarchive and the Wayback Machine: "Schlieren Optical System & Aerodynamic Tests 1958 Shell Oil Co. Educational Film XD13174". PeriscopeFilm. 2020-04-03 – via YouTube. "Schlieren Optics". Harvard Natural Sciences Lecture Demonstrations; RolfeFollow, Bryan (2015-11-25). "Schlieren Imaging: How to See Air Flow!".
In the case of black and white films, the ISO standard specifies development for specified contrast levels. In the case of color films, like C41 and E6, the times are fixed. Films like the Ektachrome P800/1600 might not actually be pushed in the technical sense, as they are developed for the appropriate time for that film, which happens to be ...
Streamy Award (2017) for "Best Science and Education Channel, Show, or Series" [2] Last updated: 19 March 2024 Derek Alexander Muller (born 9 November 1982) [ 3 ] is a science communicator and media personality, best known for his YouTube channel Veritasium , which has over 16 million subscribers and 2.8 billion views as of October 2024.