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From: pvo3366@sapphire.OCE.ORST.EDU (Paul O'Neill)
Newsgroups: comp.graphics
Subject: Re: polarized film?
Message-ID: <12991@orstcs.CS.ORST.EDU>
Date: 10 Oct 89 02:19:32 GMT
References: <475@alias.UUCP> <65539@tut.cis.ohio-state.edu> <1989Oct9.200000.29188@sj.ate.slb.com> <65904@tut.cis.ohio-state.edu>
Sender: usenet@orstcs.CS.ORST.EDU
Reply-To: pvo3366@sapphire.OCE.ORST.EDU (Paul O'Neill)
Organization: Coastal Imaging Lab, Oregon State University, Corvallis, OR
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In article <65904@tut.cis.ohio-state.edu> william c ray <ray@cis.ohio-state.edu> writes:
>how do I place the polarizers for maximum effect, ..............
>I've had very poor luck getting good separation... do I need a special 
>screen, ................. , or what?)
>


Yes, you need a "special" screen.  The old "silver-screen" type will preserve
the incoming polorization.  Newer "glass-bead" type screens scatter the
incoming polarization and are useless.


Paul O'Neill                 pvo@oce.orst.edu
Coastal Imaging Lab
OSU--Oceanography
Corvallis, OR  97331         503-754-3251