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orthochromatic

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or·tho·chro·mat·ic  (ôrth-kr-mtk)
adj. Photography
1. Of, relating to, or accurately reproducing the colors of the subject.
2. Sensitive to all colors except red: orthochromatic film.
ortho·chroma·tism (-krm-tzm) n.
orthochromatic [ˌɔːθəʊkrəʊˈmætɪk]
adj
(Miscellaneous Technologies / Photography) Photog of or relating to an emulsion giving a rendering of relative light intensities of different colours that corresponds approximately to the colour sensitivity of the eye, esp one that is insensitive to red light Sometimes shortened to ortho Compare panchromatic
orthochromatism  [ˌɔːθəʊˈkrəʊməˌtɪzəm] n
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Holm was pointing out the differences in shading between orthochromatic and panchromatic film, but I think the corollary is "old photos may be staged so they could fib a little too".
Lakota Women by Whispering Wind
10) Martha Rosler points out that many early landscape photographs were double-exposed or double-printed to render clouds in the sky because the orthochromatic emulsions of the era were incapable of achieving results where clouds and landscape were both correctly exposed at once.
Photographs: whence veracity? by Shapter, Michael / Afterimage
This is referred to as panchromatic film and is used today for all except special applications where orthochromatic film has advantages.
A bit of history--film--back then by Patti, Tony / PSA Journal
 
 
 
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