Re: Extended red sensitivity films by Kodak

[boblong@xxxxxxxxxxx (Robert Long)]

On Wed, 26 Mar 1997 23:33:42 GMT, George Smyth wrote:

|Again, I really wouldn't think of TechPan in terms of near-infrared.=20
|Perhaps someone can come up with some charts, but if I remember
|correctly, the film has increased, not extended, red sensitivity.

According to Kodak's data sheet, the spectral sensitivity curve is
sort of sway-backed through the green region then picks up to a peak
near 650 nm and produces useful response before taking a nosedive a
bit short of 700 nm.  I don't know how that compares to the Ilford
product--or to Agfa--but it does reach somewhat into the near IR.  And
I believe someone has posted here some information about using it with
opaque filters--albeit at tiny effective EIs.

|As far as tonal gradation is concerned, I feel that it is very important
|to use Technidol, the developer specifically designed for it.  By

Yes.  That is the only way I've tried it or would try it except for
special effects.  At one time, I experimented with Kodalith Ortho and
Dektol for photographing the buildings of lower Manhattan, but these
days I'd tend to do a high-contrast or posterized conversion on the
computer, using relatively normal film.

Bob Long
(boblong@xxxxxxxxxxx)

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End of INFRARED-PHOTOGRAPHY Digest 249
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