need heat absorbing filter info - rec.photo.equipment

Message from discussion need heat absorbing filter info
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Reply-To: "Jim" <jb...@cfw.com>
From: "Jim" <jb...@cfw.com>
Newsgroups: rec.photo.equipment
Subject: need heat absorbing filter info
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NNTP-Posting-Date: Wed, 01 Sep 2004 21:49:39 EDT
Date: Thu, 2 Sep 2004 05:56:20 -0400

Can someone help me with some specific information I need concerning the
heat absorbing filter used in Kodak slide projectors, or failing that, the
heat absorbing filters used in enlargers?

I need to know the infrared cutoff wavelength of these.  I suspect that
these are basicly a "low pass" filter for all UV and visual wavelengths, but
where would the cutoff be:  880nm?, lower, or ??

thanks
Jim
jb...@cfw.com