Hello?

[boblong@xxxxxxxxxxx (Robert Long)]

Anybody home?  My but it's quiet in here!

Yesterday I had an experience that astonished me, but I guess it
shouldn't have.  I had a wratten 25 plus a linear polarizer on the
lens, and I saw a picture across a pond with mountains in the
background.  When I looked through the viewfinder there were clouds
between the mountains; when I looked just through my glasses, there
were no clouds.  None.

I suppose that the clouds to the naked eye were thin enough and bluish
enough that they couldn't be resolved from the surrounding blue-gray
of the sky at the horizon.  Through the red filter and the polarizer,
which rendered the sky quite dark, the spectral differance, such as it
was, was translated into a value difference that rendered the clouds
visible.  But I still find even that explanation only partially
satisfying.

Have others had similar experiences?  How many use polarizers with
HIE?  I notice quite a difference between straight red (25 or 29)
filtering and filtering plus polarization in Kodak's IR book.

Bob Long
(boblong@xxxxxxxxxxx)

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End of INFRARED-PHOTOGRAPHY Digest 106
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