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Re: [OM] Linear polarizer, OM4T, T-flash

Subject: Re: [OM] Linear polarizer, OM4T, T-flash
From: "John A. Lind" <jlind@xxxxxxxxxxx>
Date: Sat, 07 Jul 2001 02:00:20 +0000
At 06:24 7/7/01, Andrew Fildes asked:
A question occurs. Seeing that circular pols. work with everything and
linear/top pols. are limited, why do the top manufacturers like B+W and
Heliopan continue to make linears? Is it just for economy - they're about
30heaper - or is there a situation where a linear is actually better?
AndrewF

There are still many cameras that don't need them (circulars), including all the current high end RF's. A linear has one less piece of glass in it making it very slightly cleaner for those who have a distaste for puting anything in front of their lens unless they must. A circular is a linear with a quarter-wave plate cemented to the back of the polarizing element. In other words it's two elements in one group. A linear doesn't have the quarter-wave plate; one element in one group.

Note:
The quarter-wave plate converts the linearly polarized light passing through the polarizer to circularly polarized light. This is the equivalent (not identical, but equivalent) of randomly polarized light to a half-silvered reflex mirror.

-- John


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