Christian Schonberger Posted March 27, 2016 Share Posted March 27, 2016 Hello group, Just one Q: why are there two different ASA values for black and white film stock (tungsten and daylight)? I understand that for color film stock since filters are used (either 80A or 85, both taking away light), but what about black and white? Is it the color temperature (say: 3200 vs. 5000-ish Kelvin) that directly affects the sensitivity/film speed? Any reply appreciated, Christian Link to comment Share on other sites More sharing options...
Dirk DeJonghe Posted March 27, 2016 Share Posted March 27, 2016 Yes, colour temperature influences the sensitivity. Link to comment Share on other sites More sharing options...
Christian Schonberger Posted March 27, 2016 Author Share Posted March 27, 2016 Yes, colour temperature influences the sensitivity. Thanks for the information. That explains it. Christian Link to comment Share on other sites More sharing options...
Mark Dunn Posted March 27, 2016 Share Posted March 27, 2016 Tungsten light is redder. B/W panchromatic film is a bit less sensitive to red so the speed is reduced by about 1/3 stop. Before the 1920s film was almost insensitive to red (orthochromatic). Pan was a great advance in the rendering of skin tones. 1 Link to comment Share on other sites More sharing options...
Christian Schonberger Posted March 27, 2016 Author Share Posted March 27, 2016 Tungsten light is redder. B/W panchromatic film is a bit less sensitive to red so the speed is reduced by about 1/3 stop. Before the 1920s film was almost insensitive to red (orthochromatic). Pan was a great advance in the rendering of skin tones. Thanks Mark. Yep, I remember panchromatic B/W film from the old days of photography (a few of my friends had their own labs at home) and the use of color filters to dramatically change the result. I prefer color film stock for motion pictures I am planning on. I do like fine grain B/W though - for example to make the (motion) film equivalent of fine art photography. Never found anything except test or unfinished footage though - and a Super 8mm film (shot on Canon double Super8 - surprisingly clean, sharp and steady) that won a Super 8mm short film contest way back in 1981, projected with a Bauer T 610. B/W also still pops up in music videos here and there. For some reason always in slow songs. Perhaps because it is more suitable to establish a certain mood (or period feel) and to focus on textures and lighting as opposed to fast moving subjects.... Cheers, Christian Link to comment Share on other sites More sharing options...
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