Quote:
Originally Posted by dancqu  Balanced as with color films are balanced for indoor
or outdoor use; ie taken to mean tungsten or daylight.
Unless I've forgotten the terminology?Dan |
Not forgotten, you but applying the terminology out of context. Color film is made out of layers of emulsions, each with their own sensitivity to different colors -- balencing the responce of these layers requires careful balencing of the color temperature that the film is exposed to...in order to reproduce the colors we see.
B&W films being a single emulsion layer does not have this concern. However, because B&W film differs in its sensitivity to different areas of the light spectrum, there is some effect. Thus, a yellow filter is often used with pan film to render skies closer to what our eyes see.
Copy film (ortho -- not pan) is relatively highly sensitive to blue...so in copy work, different ASA's are given to copy film depending on the light source. Tunsten light has less blue light in it -- so the ASA is lower than when used in daylight. So copy film is not "balenced" for tunsten, it is just not as sensitive to it because tunsten light has less blue light..but our light meters don't know that.