Re: Test on Kodak EIR film

["Willem-Jan Markerink" <w.j.markerink@xxxxx>]

On 25 Oct 98 at 20:36, Symon K.W. Wong wrote:

> Can anybody explain to me the phenomenon described as follows :
> 
> It's a test on Kodak EIR film by shooting at 2 seashore scenes at about 
> 11:00 am. I made 10 shots per scene with 5 in one exposure set while 5 
> in another equivalent set. All shots for one scene were taken almost at 
> the same time (+/- 1 min. between the first 5 and the subseq. 5).

I recall that Helmut Faugel has done some Schwarzschild testing, and 
concluded that (infra?)red sensitivity drops quite significantly with 
longer exposures. 1/500s vs 1/15s might be enough to trigger this 
effect....

This triggered also another idea: to decrease the extreme red tones
with E-6 development, one could add a dense ND filter....problem is
that ordinary ND filters don't block IR, so you would effectively
block all visible, including red, but not infrared. OTOH, I believe
that the very dense ND filters contain metal particles to achieve
this density in the first place, instead of organic dyes....and
metal blocks IR just as good.



 

--                 
Bye,

Willem-Jan Markerink


      The desire to understand 
is sometimes far less intelligent than
     the inability to understand


<w.j.markerink@xxxxx>
[note: 'a-one' & 'en-el'!]
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