Re: Kodak HIE film in a 120 format?

[George L Smyth <GLSmyth@xxxxxxx>]

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.

george

- -- 

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