Re: Tech Pan

["Joseph O'Neil" <joneil@xxxxxxxxxxxxxx>]

J.Wood wrote:
> 
> Have several questions regarding Kodak Tech Pan.  Although it has extended
> red sensitivity, I have not been able to detect any visual infrared
> characteristics, even using a #25 red filter.  Using Konica 750 and a #25 I
> get good IR effects.
> Has anyone used Tech Pan and produced IR effects?  If so...-SNIP-

	Read your message in whole about some problems with processing & printing tech 
pan.  I have never used it for IR effects, as it only goes to 690 nm.  If I rember 
correctly, human eyesight is supposed to be sensitive to 700nm (roughly - correct me 
if I am wrong here), so tech pan does not even go into the near IR.

	Most B&W films however only go to maybe 630 to 650 nm, so tech pan is usefull 
for detecting red, pale skin tones, etc.  It's red sensitivity is very usefull in 
astro-photography as hydrogen nebula radiate light in the red end ofthe spectrum - 
something that most normal B&W films cannot detect.  Tech pan also ahs uses ranging 
from reproduction to microscope photography and more.

	The speed of tech pan is dependant on the developer used.  For extremely fine 
 grian and reporduction work, technidol is perfered and will give you an ISO of 25.  
For portraits, landscapes, etc, Rodinal, Xtol, D76, etc can be used and give you an 
average asa of 50 to 100.  For astro-photography and other scientific applications, 
HC-110, D-19 and even Dektol for asa of 100 to 200.

	For IR effects, you will not get too much more than you would with any other 
standard B&W filma nd a red filter.  I just purchased some Afga APX S 200, so I cannot 
say about it, but so far the only two B&W filsm for IR effects are HIE and Konica 750. 
 Still, outside of IR use, tech pan can be an amazing film to work with.
joe

- -- 
jp.oneil@xxxxxxxxxxxxxxxx
http://www.multiboard.com/~joneil
B&W photos - LF to 35mm, IR, Astro, and more
*
****
*******
******************************************************
*  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  *
******************************************************

------------------------------