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Tri-X film with Daylight balanced bulb...


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#1 Steve Williams

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Posted 10 November 2014 - 04:40 PM

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


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#2 David Mullen ASC

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Posted 10 November 2014 - 05:21 PM

Mixed with daylight, I wouldn't worry about the 1/3-stop difference in speed.
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#3 Bill DiPietra

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Posted 10 November 2014 - 07:00 PM

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?


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#4 David Mullen ASC

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Posted 10 November 2014 - 07:11 PM

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.


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#5 Bill DiPietra

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Posted 10 November 2014 - 07:26 PM

Thanks, David!


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#6 Josh Gladstone

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Posted 10 November 2014 - 08:22 PM

Interesting stuff. Good to know!


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#7 Steve Williams

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Posted 10 November 2014 - 09:40 PM

awesome guys, thanks for the help and explanation.  


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