polarizer?

["paul schuster" <paul@xxxxxxxxxxxxxxxxx>]

hello list!

I recently received the maco IR 4x5.
I have only exposed a couple of sheets.

my question is:  are there any special considerations when using a polarizer
and IR.  I stacked the filters (#25 red and the ploarizer).  I had heard it
would only act as a neutral density filter when using IR (what I was going
for).  I had the red on first and then the polarizer.  now normally, I would
turn the ploarizer until I got the desired effect.  but I was unable to see
much change through the red.  I guess next time I will put the polarizer on
first and red last.

the day was a bit hazy.  I had figured that if the polarizer did do anything
it would naturally make my usually dark/black (actual blue) skies even
darker.  but they are white on the resulting image?  could be the haze?

also!:  is my math correct in my filter factor of 5.5?  a filter factor of 3
for the 25 red, and 2.5 for the polarizer.  bringing my maco ISO 100 to
around 3 or less ?

this 4x5 IR ain't cheap!  I'm just trying to save some head ache and much
needed $

any suggestions would be much appreciated

p.s. YES, I am trying to slow down the film as much as possible.  I am
hoping for 3+ second exposures to blur all ambient movement, waves mostly

paul schuster
www.schusterphoto.com

*
****
*******
******************************************************
*  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  *
******************************************************