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Re: Tungsten Studio Light

  • From: Scott Donkin <photos@xxxxxxxxxx>
  • Subject: Re: Tungsten Studio Light
  • Date: Sun, 17 Nov 1996 13:06:12 +1100
At 10:35 PM 09/11/96 +0000, you wrote:
>Last week I shot two rolls of Konica IR under tungsten studio lights. I
>used a #25 Wratten for filtration and used a Gossen Luna Pro F rated at ISO
>40.
>
>Evidently the film picks up a lot of speed under tungsten light!

That's because of the lower colur temp of your tungsten lighting - it
outputs more red.  That, and the fact you were using a #25 filter.

If you were using flash, AND an IR filter (89B or 87), then you'd find the
flash, due to it's fairly high IR output, would give good exposures.  I'd
imaging, in this respect, the exposures with Tungsten and flash would yield
similar ISO's for your subject / development rate.


Cya...

   ______
   Sco||                E-mail:   photos@xxxxxxxxxx
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..due to the current economic situation, the light at the end of the tunnel
has been turned off until further notice.


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Topic No. 5