Tri-X Reversal ASA
Posted 01 November 2008 - 02:09 PM
Posted 01 November 2008 - 03:22 PM
Posted 01 November 2008 - 05:40 PM
If you want to shoot colour film at other temperatures, ie daylight film undertungsten, the label doestwll you what EI ot start with with the corection filter. Thew filters are not needed for B&W hence the instuctions focus on the light itelf.
Color film is balanced for certain color temperatures and it's EI based on that.
Posted 01 November 2008 - 07:53 PM
Okay, that makes perfect sense. I figured this was a simple question. Thanks,
It has to do with the sensitivity of parts of the emulsion to differing parts of the visual light spectrum; notably blue and red. It's more sensitive to blue; hence the faster speed in daylight, than it is to red. This is true of B/w film only. Color film is balanced for certain color temperatures and it's EI based on that.