Re: nice spectral plots of both film & filters

[Dan Cardish <dcardish@xxxxxxxxxxxx>]

At 12:31 AM 20-04-98 -0400, you wrote:
>
>
>----------
>From: Willem-Jan Markerink <w.j.markerink@xxxxx>
>To: infrared@xxxxx
>Subject: nice spectral plots of both film & filters
>Date: Sunday, April 19, 1998 6:54 PM
>
>Someone pointed me to this nice page, with spectral charts of both 
>IR film and filters:
>
>http://photo.net/photo/edscott/ir000020.htm
>
One thing that these charts drives home to me is the relative utility (or
lack of) of the various 87 series filters.  I have never been able to see
the reasoning behind using anything other than a #87 filter with HIE film.
 Since the 87 is visually opaque, it should be the most desirable for
non-scientific uses. The 'higher' order filters such as the 87C,B,A all cut
off useful IR from the film.  I can't see how there can be any gain in
image quality by eliminating any of the IR wavelengths past 700 nm.

Dan C.
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