[rollei_list] Re: Rollie R3 film

Richard, the film base support for the R3 is
polyester, not cellulose and it is one of the most
advanced films made today.
The emulsion of ROLLEI R³ is made up of three
extremely thin layers with silver halides of different
size and three different degrees of sensitivity. This
technology leaves a very wide margin for controlling
the properties of the material by suitable selection
of developers and development time. As a result,
ROLLEI R³ allows the entire spectrum from fine-grain
low-speed images (ISO 25/15°) to maximum-speed images
(ISO 6400/39°) to be used with considerably better
shadow detail and finer tonal rendering than with
films pushed the conventional way.
Another specialty of ROLLEI R³ is its antihalation
layer that is coated directly on the transparent film
base. This results in greater sharpness, since
reflections are not allowed to penetrate the film
support before being reduced, but are eliminated even
before they can enter the base.
ROLLEI R³ is suitable for all kinds of pictorial
applications. This applies above all to portraiture,
but also to theater and available-light photography.
A new field of application for this type of film is
architectural photography. Here, sheet film and very
low ISO values are widely used in order to attain
extremely high resolution and fine grain.
The film may be processed in many different B+W
developers, with a wide margin of control.
The glass-clear material of the PET support makes the
material suitable for use as B+W slide film. A special
protective SUPERCOAT results in greater resistance to
aggressive photo chemicals.
The polyester film support guarantees the highest
level of archive stability.
You can see the complete specs, explanations and
diagrams on this film here:
http://www.silverprint.co.uk/PDF/GBA-R3_GB_18.10.pdf

All the best
Carlos
--- Richard Knoppow <dickburk@xxxxxxxxxxxxx> escribió:

> 
> ----- Original Message ----- 
> From: "Laurence Cuffe" <cuffe@xxxxxxx>
> To: <rollei_list@xxxxxxxxxxxxx>
> Sent: Monday, July 30, 2007 12:35 PM
> Subject: [rollei_list] Re: Rollie R3 film
> 
> 
> > Dear All
> > I shot a roll of Rollei R3 film shortly after it
> came out. 
> > With one roll I tried using a piece of overexposed
> slide 
> > film inside the camera as an IR filter and the
> results 
> > were a failure. I dumped the film in a corner of
> the 
> > darkroom and didn't look at it till today. I
> picked it up 
> > for my daughter to use to practice loading 120
> into a 
> > developing reel and discovered that the film is 
> > delaminating big time. Its separating into three
> layers, 
> > two thin outer layers one on each side, one of
> which seems 
> > to contain the image and a central more rigid
> transparent 
> > layer.
> > Has any one else encountered this?  One thing I
> should 
> > stress is that this was not by any manner of means
> normal 
> > film storage conditions. Humidity probably cycles
> 50-100% 
> > and there is probably a significant amount of
> airborne 
> > chemistry from time to time.
> > Any thoughts welcome
> > Larry Cuffe
> > ---
> > Rollei List
> 
>     I've never seen this happen without very high
> heat or 
> chemical treatment. What you are seeing is the
> emulsion and 
> the anti-curling gelatin layer on the back coming
> off the 
> support. Films and plates usually have a substrate
> coated on 
> the support to "glue" the gelatin layers on.
> Evidently, the 
> technology available to the makers of this film is
> not very 
> advanced or else the discarded film was subjected to
> some 
> quite unusual conditions.
>     I don't know for certain what is currently used
> for 
> subbing but the old technology for safety base film
> was to 
> use a very thin coating of Cellulose Nitrate under
> the 
> emulsion and back-coating because gelatin does not
> stick to 
> Cellulose Acetate very well.
>     There are people doing alternative processes who
> would 
> _love_ to know an easy way of stripping the emulsion
> from 
> either film or paper without damaging it. One can
> get it off 
> easily using very hot water but that begins to
> dissolve the 
> coatings. Household bleach will strip everything off
> down to 
> the support, not exactly useful if you want to
> preserve the 
> image.
> 
> ---
> Richard Knoppow
> Los Angeles, CA, USA
> dickburk@xxxxxxxxxxxxx 
> 
> ---
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