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(fwd) Re: thin film NIR blocking?
have you looked at the transmission curves of some of the Kodak gelatin filters? they're not robust as glass, but could work for short term or if you only needed the filter for a few exposures. the thing about using them over exposed film which could be affected by processing is that you know what the properties are.
regards.
Frank Schiffel
Research Analyst III
Bureau of Health Resource Statistics
State Center for Health Statistics
920 Wildwood Drive
PO Box 570
Jefferson City Missouri 65102-0570
(573) 751-6279
FAX (573) 526-4102
visit our website at: http://www.health.state.mo.us/
>>> Willem-Jan Markerink <w.j.markerink@xxxxx> 11/12/98 8:25:48 PM >>>
From: Gregory Whaley <greg.whaley@xxxxxxx>
Newsgroups: sci.optics
Subject: Re: thin film NIR blocking?
Date: Wed, 11 Nov 1998 21:59:08 -0600
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Status: N
Don Stauffer wrote:
> Okay, this is the reverse of what you asked for, but I would love to see
> a cheap film that would only PASS the near IR, at the wavelength of some
> of the popular IR emitting diodes.
My favorite near IR transmitting and visible blocking film is unexposed and
developed slide film (Ektachrome). It has an optical density > 3.0 in the
visible, and around 0.3 at 800 nm. I suppose that fully exposed and developed
_print_ film (C41) might work too, but I have not tried it.
Greg
--
Bye,
Willem-Jan Markerink
The desire to understand
is sometimes far less intelligent than
the inability to understand
<w.j.markerink@xxxxx>
[note: 'a-one' & 'en-el'!]
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