Re: Kodak Film Speed Questions

[George L Smyth <glsmyth@xxxxxxxxxxxxxxxxx>]

On Fri, 3 Sep 1999, Weaver, Patrick wrote:

> I want to know what film speed I should set Kodak B&W High Speed Infrared
> Film to. The reason i ask is that i set it as 400 ISO as recommended in a
> magazine however when I asked my lab to process it at 400 they said it was
> off the scale and should be rated 50 ISO. I am now confused , do I rate it
> at 400 and have it processed at another speed?

What the heck does "off the scale" mean?  HIE should be rated however YOU
feel it should be rated.  I've shot it between EI 50 and EI 1000.  My
"normal" shooting speed is EI 250, when metered through a #25 filter.

For about $50 you can get everything you need to develop your own B&W
film.  Cost for developing a roll should be less than $1.  This done, you
would have complete control over the process, as opposed to hoping that
someone might do the right thing.
 
> Also should I use the same ISO setting using a red filter as using a
> IR72(HOYA) filter?

No.  The R72 will lose at least a couple of stops over and above the #25.
I make a reading with the #25 filter, then shoot 2-5 stops slower,
depending upon the scene.

Cheers -

george

---
Handmade Photographic Images
http://www2.ari.net/glsmyth/

*
****
*******
******************************************************
*  To remove yourself from this list, send:          *
*         UNSUBSCRIBE INFRARED                       *
*       to                                           *
*         MAJORDOMO@xxxxx                            *
*----------------------------------------------------*
*   For the IR-FAQ, IR-Gallery and heaps of links:   *
*  http://www.a1.nl/phomepag/markerink/mainpage.htm  *
******************************************************