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When I hear foil, I automatically think of metal.
The plastic is quite thin, like a gelatin filter.
bill Pearce
----- Original Message ----- 
From: <usher99@xxxxxxx>
To: <olympus@xxxxxxxxxx>
Sent: Monday, October 20, 2008 6:29 PM
Subject: [OM] Re: Pol question
>
> Aaah,
> Thanks Charlie and Bill, you have awoken some dormant neurons.
> Now  I remember Walt liked the Kaeseman pols that sealed in the
> polarizing foil.  So my confusion is how the sandwich is made.  The
> ones where the back glass is fixed to the frame appears to be the "two
> piece." Perhaps some use polarizing film rather than foil.  I can rest
> easier.  Clearly can't use two polarizing films in one filter, though
> wonder if those expensive Singh-ray variable ND filters actutally use
> crossed pols.
> Thanks  again for your help.
>
> Mike
>
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