Kodak B&W Neg IR sensitivity

[Gregory Almond]

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 Almond]

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?

[Simon Wyss]

Yes, it is. The rest has to do with the lenses.

[Mark Dunn]

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.

[John Salim]

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 February 21, 2009 by John Salim