Re: Aerographic 2424 has a speed of 400 ISO?

[Don Roberts <droberts@xxxxxxxxxxxxx>]

ROLLAND ELLIOTT (Quality Assurance Co-Op) wrote:
> 
>  >The 70mm HIE is actually Kodak Aerographic 2424 ISO 400. It comes in
>  >150' rolls which you must spool into cassettes. In the dark, you must
> >then start the film into another cassette and insert both into the back.
> I talked to a Kodak representative and he said that all of Kodak's B&W infrared
> film had the same emulsion no matter what the format.  I specfically asked him
> if the 70mm Aerographic 2424 had the same emulsion as the 35mm HIE and he said
> yes.
> 
> If this is true why does Aero. 2424 have an ISO of 400, while 35mm HIE has a
> nominal ISO of 200?Do people who use this film actually rate it at 400 or do
> you rate it at the same EI as HIE?
> Thanks Rolland Elliott

Roland, I use 2424 but rate it a t 200 for terrestrial use.  I'm
guessing ht e higher ISO is because of the nature of aerial work may
involve much more IR and fewer shadows because of the high angle.  Any
other ideas?
  
Don Roberts 
Bittersweet Productions
Iowa City, IA

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