Why would they not put it in the professional level films?
----- Original Message -----
From: "John A. Lind" <jlind@xxxxxxxxxxxx>
To: <olympus@xxxxxxxxxxxxxxx>
Sent: Tuesday, October 22, 2002 8:05 AM
Subject: Re: [OM] 4 layer films
> At 15:27 10/21/02, iwert asked:
> >Hello, I am in a curious mood again...
> >
> > >From time to time '4 layer film' appears on the list. What exactly is
this,
> >and anyone who knows how it works. Why and when do you need it? Is any
> >special development needed, and does it exist as color negative and
slides?
>
> It's proprietary to Fuji and includes an additional Cyan layer in the film
> emulsion. Fuji claims it aids in color balancing prints from daylight
film
> shot under other than pure daylight, especially with fluorescents which
are
> more problematic than incandescents. It apparently works as I've had less
> problem with properly balanced prints (from a pro lab) using Fuji color
> negative films with this feature than with Kodak's. In their consumer
> films it's found in the "Superia" line of color negative, including Reala,
> but *not* the NHG II color negative or the Sensia E-6 films. In their
> professional line it's found in all their color negative films, but *not*
> in their E-6 films. All Fuji's color negative films are C-41 process,
same
> as all other daylight color negative films in current production.
>
> Pull up a data sheet for one of their pro films, or one of their consumer
> Superia films (they're PDF files found under Service and Support):
> Ex: http://www.fujifilm.com/JSP/fuji/epartners/bin/AF3-007E.pdf
>
> Scroll down the PDF data sheet until you get to the film/emulsion
> structure. Typical C-41 films have three layers sensitive to a portion of
> visible light:
> (1) blue sensitive (creates a yellow image in the negative)
> (2) green sensitive (creates a magenta image in the negative
> plus has yellow couplers), and
> (3) red sensitive (creates a cyan image in the negative).
> On raw film there is also a protective layer on top of it all and an
> interlayer under each of the three color sensitive ones (the one under the
> blue layer has a yellow filter in it). Finally, there's an opaque
> anti-halation layer between the rest of the emulsion and the film
> base. The opaque substance in the anti-halation layer is washed out
during
> developing.
>
> The middle (green sensitive) layer in Fuji's color negative films with
"4th
> layer technology" is slightly different. It's split into two sub-layers
> without any interlayer between them. The top two-thirds is similar to all
> other color negative, but the bottom third is cyan sensitive producing a
> light magenta image when developed. This means it's also sensitive to
> longer wavelength blue in addition to shorter wavelength green, spanning
> the upper green and lower blue portion of the spectrum. If you scroll
down
> further and look at spectral response curve, you will see this fourth
layer
> represented as a dashed line.
>
> Again, this "4th layer" (actually a sub-layer to the middle one) is only
> found in Fuji's consumer Superia and all their professional color negative
> films. It's not in *any* of their E-6 films, consumer or professional.
>
> -- John
>
>
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