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Re: polarizing filters with b&w infrared

  • From: rrosener@xxxxxxxxxx (Russell Rosener)
  • Subject: Re: polarizing filters with b&w infrared
  • Date: Wed, 30 Oct 1996 20:34:14 -0500

>
>On the contrary, if you want a black sky, use of a polarizer can
>materially darken the sky with a #25 filter, which is what I was
>using.  The difference admittedly is only slight with the #87 filter.
>
>Bob Long
>(boblong@xxxxxxxxxxx)

Isn't the dark result because a polarizer is only polarizing the visible
spectrum which HIE is also sensitive to?
It seems there is little difference when using a polarizer with a #87
filter because most of the visible light is filtered out by the IR filter.

Russ Rosener
rrosener@xxxxxxxxxx

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* TWO AND TWO MAKE FIVE! *
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* George Orwell, 1984.   *
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Topic No. 31