Education on IR ! ! !

[Jason Revell <jason.revell@xxxxxxxxx>]

I just found this reply to a lecture's querry on IR film.  I am please to
see that the lecture who posted it said he know very little about the film
(if only my lecturer had said that I would have save a few rolls !), but the
thing that frightens me is that this reply is from another lecturer who is a
'expert' ! 

<With regard to true IR photography in b/w use Kodak HIE. Go on line to
Kokak, Profession Products, search for HIE 135 Infra Red Film. You will get
excellent advice on exposure and development.>

Not my experience.

<What else you need to know is the film's sensitivity! It is sensitive to
Ultra Violet, Blue, Red, and Infra red out to about 900nm or possibly a bit
more.
Since it is "seeing UV and Blue, you must subract them using a Red (A25)>

Have I had it wrong all these years?  (Anyway I would of thought a yellow
would subtract the UV and blue better than the red which will of course work
I guess!)

<Color IR film, Infra Red Ektachrome, is made like any other chrome film
except that the red layer is sensitive to red and infra red.>

So why should a red (with no IR reflectance) go green!

I hope this makes you laugh.

Jason
*
****
*******
******************************************************
*  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  *
******************************************************