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B&W- Setting the right ASA


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#1 Jan Weis

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Posted 13 June 2006 - 07:53 AM

Imagine this, You are in a building which is lit by sunlight from the outside through windows. Do I set the the film speed as outdoors or indoors. I assume that I should set it as out doors since it is sunlight we're talking about but I want to make sure not to make a mistake after all its my first short film.

here's a shot of the set:

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//Jan
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#2 John Pytlak RIP

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Posted 13 June 2006 - 09:54 AM

If the light source is unfiltered daylight, treat it as daylight. Compared to tungsten light, daylight has more energy in the blue portion of the spectrum. Be careful, as some energy-efficient windows may be "tinted" and have some coloration.

Most panchromatic B&W camera films have a bit more sensitivity in the blue portion of the spectrum than the red. So a blue-rich daylight source is a bit more effective in exposing the film, and the film exposure index for daylight illumination is about 1/3 stop faster.
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#3 David Mullen ASC

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Posted 13 June 2006 - 12:20 PM

Yes, in daylight color balance, whether indoors or outdoors, use the daylight ASA rating.

However, note that there is only a 1/3-stop difference between that and the tungsten rating, so it's not the end of the world if you use that rating instead. I also use the tungsten rating when adding any orange-to-red filters, since now the light hitting the film is at that spectrum.
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#4 Jan Weis

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Posted 14 June 2006 - 06:01 PM

I'm glad it wont be the end of the world if I mess the ASA setting up but I'm even glad that I now know what ASA to set it as and for that I thank you both John & David.

//Jan
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