polarizing filters with b&w infrared

[JoePaduano@xxxxxxx]

A few days ago there was a question regarding the use of polarizing filters
with b&w infrared film. The person noted that in Kodak's Applied Infrared
Photography book ( which I also own ) there were two examples, one was a shot
taken with an 87 filter only and one with an 87 and polarizer. The writer
noticed that the shot with both filters had more contrast and assumed a
polarizer should be used in addition to a no.25 or 29 red filter as well. My
response is that if you look at the two photos , you would be hard pressed to
notice any difference at all in contrast , very minimal at best. Also take
into account that 2-2 1/2 stops of light would be cut out with use of  a
 polarizer in addition to the light absorbed by a red or infrared filter. Not
a good or practical combination of filters for these reasons and besides
polarizing filters can only polarize visible light, not infrared light.
                                                                      joe

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Topic No. 2