Re: Kodak HIE film in a 120 format?

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

On  3 Aug 98 at 18:56, George L Smyth wrote:

> Willem-Jan Markerink wrote:
> > 
> > The Wood-effect starts at 695nm, so it is less a matter of capturing
> > light at 800nm that wasn't there in the first place, but a matter of
> > blocking unwanted visible. And visible ends at 780nm, while you are not
> > able to look through a #87 at daylight intensities.
> > With HIE & #87C at 12 ASA, I don't see much difference in 2 ASA for
> > Konica & #87. That's lousy two-and-a-half extra stops....go one or
> > two steps up, #87B or #87A, and you might be slower off than with
> > Konica.
> > 
> > With this line of reasoning, one couldn't even call Ilford or Agfa
> > extended-red films.
> 
> WJ -
> 
> What would your definition of "extended-red" be?  We tend to toss this term
> around, yet I'm not sure what the precise definition might be.  I think of it as
> film that extends beyone 680nm but not beyond 720nm.  For instance, I consider
> Kodak Technical Pan film to be an extended-red film because its spectral
> sensitivity extends to about 700nm.

Don't know....you could use the riddle 580nm = red, 780nm = infrared, 
and 680 = extended red.
I love things easy to remember, just like Sunny-16....:-))


 

- -- 
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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