Re: Stigmata

["Karl & Anita Shah-Jenner" <shahjen@xxxxxxxxxx>]

Hi Otto,
yes water absorbs IR, and a lot of other wavelengths up the red end of the
spectrum too, just have a look at any underwater photo.  They are all blue!
:-)

I was also involved a number of years ago in irrigating a roof's glass
panels - purely to reduce the amount of heat that came through and, although
the customer - a large shopping complex never went ahead with it, the
prototype proved very effective in cutting down the heat.

Karl
West Australia


-----Original Message-----
From: Otto Giesenfeld <otto.giesenfeld@xxxxxxxxxxxx>
To: infrared@xxxxx <infrared@xxxxx>
Date: Monday, March 20, 2000 9:00
Subject: Re: Stigmata


>--On den 20 mars 2000, 15:38 +0800 Karl & Anita Shah-Jenner
><shahjen@xxxxxxxxxx> wrote:
>
>> ...
>> and as anyone who has taken a photo
>> across a body of water will attest, water absorbs the wavelengths of IR
>> that IR film records and thus looks dark!
>>
>
>Is this really the explanation? If the rendering of a water surface in
>general photography is due to reflections of the sky, then the reason for
>dark water in IR photography might be the dark sky... Anyone knows for
sure?
>
>Best regards,
>
>Otto Giesenfeld
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