Re: Infrared Film Spectral Response

[George L Smyth <glsmyth@xxxxxxxxxxxxxxxxx>]

On Wed, 29 Sep 1999 gmm25@xxxxxxxxxxxx wrote:

> Listmates,
>     Hello, I am new to this list, and was wondering if anyone had any comments
> on finding, or making a film that was sensitive to further infrared light.
> For instance the kodak high speed infrared is sensitive out to about 1000nm,
> Does anyone have any ideas on obtaining or sensitizing a film so that it can
> "see" light perhaps out to 1500nm?
> 
> I was thinking of perhaps gas hypering the film, or sensitizing it in some
> other way, or perhaps there is a specialty film out there that I do not know
> about?

It is not possible to sensitize film beyond 1200nm.  There is a Russian
film (I am told) that does extend to this point.  However, it needs to be
constantly refrigerated - i.e. it would be fogged by the time it gets to
you.

Gas hypering film may increase, but will not extend the dye's sensitivity.
I believe that Kodak's sensitivity limit of 900nm is about as good as it
gets.

george

---
Handmade Photographic Images
http://www2.ari.net/glsmyth/

*
****
*******
******************************************************
*  To remove yourself from this list, send:          *
*         UNSUBSCRIBE INFRARED                       *
*       to                                           *
*         MAJORDOMO@xxxxx                            *
*----------------------------------------------------*
*   For the IR-FAQ, IR-Gallery and heaps of links:   *
*  http://www.a1.nl/phomepag/markerink/mainpage.htm  *
******************************************************