Re: Ektachrome IR 200ASA/+2push vs 50ASA/no push

[George L Smyth <GLSmyth@xxxxxxx>]

Willem-Jan Markerink wrote:
> 
> On 21 Mar 97 at 21:56, JoePaduano@xxxxxxx wrote:
> 
> > Willem, the new info from Kodak is to shoot the film at ISO 200, but it can
> > be pushed 1 stop, not 2 if processing in E-6.
> >                                                             Joe Paduano
> 
> Does that read that it *can* be pushed 1 stop, or that it *must* be
> pushed 1 stop?
> Or refrasing/updating my question: what is the difference between
> 200ASA/push +1 and 100ASA/no push?
> 
> I recall that, in general, contrast increases when pushing, right?
> Would the film lack sufficient contrast at 100ASA/no push?

I don't think that Kodak will mind me posting this here.  This is from
Kodak's Web page.

-----------------------

The new Kodak Eklachrome professional infrared EIR film features fine
grain, medium sharpness and a 4-mil thick Estar base.  It has normal
sensitivity to both ultraviolet and visible colors found between 380 and
700 manometers, and sensitivity to infrared radiation found between 700
and 900 manometers.  Kodak Ektachrome professional infrared EIR film can
be developed in either Process AR-5 or Process E-6 depending upon the
desired results.  Photographs developed in Process AR-5 will produce a
more accurate record of infrared detail while photographs developed
using Process E-6 will produce images with higher color saturation and
contrast.  Processing also affects film speed, with film developed using
Process E-6 exibiting twice the speed of film developed using Process
AR-5.  However, a fixed film speed and DX Coding cannot be applied to
this film because camera exposure meters are not calibrated for infrared
radiation.

When using Kodak Eklachrome professional infrared EIR film in daylight
with a Kodak Wratten No. 12 filter, a good starting point for film
developed using AR-5 is an exposure index of 100, or an E.I. of 200 for
film using E-6.  In order to increase film speed, push processing is
also possible with Process E-6.  As with earlier versions of Kodak
infrared-sensitive slide films, Kodak Ektachrome infrared EIR film
requires special storage and handling.  Since this film is highly
sensitive to storage temperature, freezer storage is recommended for
optimal sensitivity, although the film can be stored at 55 degrees for
up to a month without severe consequences.  Loading and unloading should
be performed in total darkness and users should make certain that their
labs avoid infrared sources which may fog the film, such as sensors in
the E-6 processor and night vision goggles.

----------------------------

george

-- 
 Handmade Photographic Images     
  http://www2.ari.net/glsmyth/

------------------------------