"Peter Irwin" wrote in message
...
piterengel wrote:
Hi everybody. I need for a certain work to obtain some
positives from
negatives. I can't treat all film with positive method,
because a part
of photos must remain negatives. I have a Contax Auto PC
Bellow with
slide duplicator, and a RTS II camera. Photos are taken
using an
Ilford Delta 100 film, developed in ID11. I want to use
the same film
for positives. My questions a

The film to use for making positives on 35mm film is
Eastman 5302 Fine Grain Release Positive. I bought
some from Kodak in Toronto a few years ago for something
like $CAN 17 for a 100 foot roll. Kodak Motion Imaging
will probably still be willing to sell you a roll, it
is also listed for sale at electron microscope suppliers
because it is used by some models of electron microscopes
as well as by the motion picture industry.

The speed of 5302 is somewhere around 3 ASA, but this
depends a bit on development and how much blue and violet
are in the light source. Develop in Dektol 1:1 for 5
minutes.
You can adjust contrast a little by playing around with
different developers. The film looks like white plastic.
It can be handled fairly freely under any safelight for
B&W enlarging paper. You should have no trouble bulk
loading
it into 135 cartridges by hand.

Peter.
--


The problem is that this film may now be available only
in 1000 foot spools but do check. Kodak may still have a
data sheet for it. The sheet gives development instructions
for various degrees of contrast, all using readily available
developers. While not many B&W movies are made now the film
was also used for special effects masks and other purposes.
The speed is comparable to fast enlarging paper and its
handled about the same way. Because the spectral sensitivity
is confined to the blue it can be handled under an OC
safelight although I think Kodak recommends a red light.
Processing is very much like RC printing paper. If you can
obtain it economically its definitely the stuff to use.


--
--
Richard Knoppow
Los Angeles, CA, USA