Steve Williams Posted November 10, 2014 Share Posted November 10, 2014 Tomorrow I have a shoot that I had planned to film with TriX. The interior will be mostly filled with daylight, but I plan on adding in an external light if needed (daylight balanced bulbs). My question is, do I meter as if the film is reading 200 or 160 (for the tungsten bulb). I'm guessing 200, but I'm trying to cross my t's and dot my i's before jumping in. Best regards, Steve Link to comment Share on other sites More sharing options...
Premium Member David Mullen ASC Posted November 10, 2014 Premium Member Share Posted November 10, 2014 Mixed with daylight, I wouldn't worry about the 1/3-stop difference in speed. 1 Link to comment Share on other sites More sharing options...
Premium Member Bill DiPietra Posted November 11, 2014 Premium Member Share Posted November 11, 2014 Mixed with daylight, I wouldn't worry about the 1/3-stop difference in speed. On that note, why is there a difference in speed for daylight/tungsten? Does the blue in daylight add a 1/3 of a stop? Link to comment Share on other sites More sharing options...
Premium Member David Mullen ASC Posted November 11, 2014 Premium Member Share Posted November 11, 2014 Though modern b&w film is panchromatic (sensitive to all visible colors) it is slightly more sensitive towards the bluer end of the spectrum. Early b&w film was blue-sensitive only, then blue-green (orthochromatic, "ortho" meaning "correct" as in "correct colors"), and then panchromatic, "pan" meaning "all". I guess it's because blue wavelengths have a higher frequency and thus carry more energy. 1 Link to comment Share on other sites More sharing options...
Premium Member Bill DiPietra Posted November 11, 2014 Premium Member Share Posted November 11, 2014 Thanks, David! Link to comment Share on other sites More sharing options...
Josh Gladstone Posted November 11, 2014 Share Posted November 11, 2014 Interesting stuff. Good to know! Link to comment Share on other sites More sharing options...
Steve Williams Posted November 11, 2014 Author Share Posted November 11, 2014 awesome guys, thanks for the help and explanation. Link to comment Share on other sites More sharing options...
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