Re: B&W IE

[Daniel Cardish <dcardish@xxxxxxxxxxxxx>]

At 06:20 PM 12/10/96 +0100, you wrote:
>Robert-- You might have forgotten that a red filter used with Ektachrome
>infrared does not produce red coloration in the sky or vegetation. Vegetation
>reproduces in orange tones , the sky becomes green and there is a yellow cast
>to  the white areas of the image.  Infrared filters are not recommended by
>Kodak for Ektachrome infrared.
>                                                                     joe

I think that the key difference between B/W IR and Ektachrome IR film is
that in the case of the colour film, only one of the film layers is
sensative to infrared light.  If you use a IR filter on the lens, you will
be blocking out the remaining two layers on the film, essentially turning
the film monochromatic.  The interesting effects of the film are due to the
interplay between the non-IR and IR layers.
>


Dan Cardish  <dcardish@xxxxxxxxxxxxx>
                        <http://www.spherenet.com/dcardish/photo.htm>
        


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Topic No. 8