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Re: [OM] T10 flash and Ring Cross Polarizers

Subject: Re: [OM] T10 flash and Ring Cross Polarizers
From: "Skip Williams" <skipwilliamsom@xxxxxxxxxxx>
Date: Fri, 28 Dec 2001 11:53:24 -0500
Cc: hanse112@xxxxxxxxxx
Dean,

Have you got any pictures to show of the spiders?

Skip


From: "Dean C. Hansen" <hanse112@xxxxxxxxxx>
Reply-To: olympus@xxxxxxxxxxxxxxx
To: olympus@xxxxxxxxxxxxxxx
Subject: [OM] T10 flash and Ring Cross Polarizers
Date: Fri, 28 Dec 2001 10:45:58 -0600

    A couple years ago, I came across an explaination of
cross-polarization in George Lepp's "Beyond the Basics;  Innovative
Techniques for Outdoor/Nature Photography" (pp. 40-48), and I built a
device to hold polarizing material in front of two T32's.  I use this
set up to photograph jumping spiders (4-8 mm long) with a 38mm macro OM
lens and telescopic autotube on an OM4T.  A polarizing filter on the
lens, set at 90 degrees to the gratings of the polarizing material on
the flashes, completes the set up.
    The results are very nice:  colors are more natural, and I can
eliminate strong reflections that look like white stripes on the
spider.  I am very happy with the results.  Cross polarization is a
very, very useful technique for some subjects.  The downside is the
amount of light lost (Lepp says up to 5 stops).
    While the OM ring flashes can take an OM cross-polarization filter,
you are not confined to using the special OM ring flashes if you want to
use cross-polarization--with a little time in the shop, you can make a
cross-polarization set up for use with any of the other (e.g., T20 &
T32) OM flashes.
Dean


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