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Kodak B&W Neg IR sensitivity


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#1 Gregory Almond

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Posted 02 January 2009 - 10:55 AM

How sensitive is Kodak Plus-X or Double-X film to infrared light? I assume they are low in sensitivity, however a project i am working on could possibly require infrared lighting and i want to make sure if necessary i am to compensate.

~G
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#2 Gregory Almond

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Posted 02 January 2009 - 11:01 AM

I went onto wikipedia and it said that infrared was 750nm - 1mm in wavelength, and the filmstocks had a sensitivity from 400nm to slightly>650nm, so that would mean the light is beyond the films capacity to expose.

Is this correct?
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#3 Simon Wyss

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Posted 02 January 2009 - 12:56 PM

Yes, it is. The rest has to do with the lenses.
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#4 Mark Dunn

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Posted 02 January 2009 - 03:04 PM

Ordinary mono film is only sensitive to IR in the sense that you shouldn't get it hot. You can't image it.
B/W IR film is exposed through a deep red filter, to absorb the visible wavelengths to which it is slightly sensitive- those pesky reds around 650-750nm.
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#5 John Salim

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Posted 20 February 2009 - 07:31 PM

How sensitive is Kodak Plus-X or Double-X film to infrared light? I assume they are low in sensitivity, however a project i am working on could possibly require infrared lighting and i want to make sure if necessary i am to compensate.

~G


Gregory, These films are not sensitive to IR. I use IR safelighting ( with viewing goggles ) in the lab for all colour and B&W film ( except IR films of course ).

Film that's damaged by heat, is damaged by heat ! not IR.

John S

Edited by John Salim, 20 February 2009 - 07:33 PM.

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