Re: Myth of Heat exposing IR film

[Luvdove6@xxxxxxx]

Well many people think IR film records heat because what IR is used for in 
other terms besides film or photography is for night vision.  Like you'll 
hear it used by military or other people like spys who use it and it actually 
does react by heat.  So they can see people clearly because the heat from the 
skin gives a red color against the black background...   anyway the film 
isn't the same concept and that is what people don't know right away!  Hate 
to use this example but remember Silence of the Lambs?  They used an infra 
red telescope or binoculars in that movie in one of the scenes..  


> When I was buying my outdated film yesterday, someone made a joke about 
> taking
>  it out in the hot California sun.  I was puzzled until I realized he was
>  referring to the old myth about IR film recording heat and we had a little
>  discussion.  I explained that IR is a very broad spectrum of which film
>  records a small bit but I couldn't remember that it is near IR the film
>  records and far IR that produces heat until I got home and checked my 
> references.
>  
>  Anyway, he seemed sure that he was able to record heat with IR film many 
> years
>  ago.  Now I don't know the subject so it very well could have been 
something
>  that emitted both near and far IR, thus the confusion.  But I wonder, was 
or
>  is there some special application, eg. military or scientific, that
>  incorporates some IR technology that has caused this confusion or is it 
just 
> a
>  erroneous observation due to things like the "glow" of human skin on IR 
film
>  that makes people think heat?  It would be nice to have as much info
>  (ammunition) as possible to help debunk this myth.
>  
>  Bertha
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