Re: How can I recognice 'old' Ektachrome IR?

[Helmut Faugel TE <htf@xxxxxxxxxxxxxxxxxxx>]

On Tue, 25 Mar 1997, George L Smyth wrote:

> My suggestion is to
> pass on this and save your money for the E6 film in June.

What is the real difference between the E6 film and the E4 film? In
the G. Spitzings book published in 1968 (!) there is some data published
on a film called Kodak Aero Ektachrome Infrared which could be processed
using E2 or E4 chemistry. The current E4 Ektachrome IR and the E6 EIR
have the same emulsion number 2236, and if one compairs the speed and
the spectral sensitivity of the three sources of information I have it
seams to me that this film hasn't been improved in the last 30 years,
it has only been matched to the current Ektachrome process with 20 years
delay.

On the other hand the lack of improvement is a big deal for science,
because the results can be compaired directly no mater how many years
have passed (Ok, only if the slides are stored under good conditions).
But a reciprocity failure of 1 stop at 1/10s is very limiting for low
light subjects.

 
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