Archived posting to the Leica Users Group, 1997/03/20

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Subject: Re: Circular/Linear Polarizers
From: "Peter Jon White" <pjwhite@tiac.net>
Date: Thu, 20 Mar 1997 09:14:15 +0000

Kari said,

> Linear works very simply as well. It is a unfortunate misconception  
> that linear polarizer doesn't work with beam splitter meters.

<snip>

Greetings,

While this may work in many situations, it can easily lead to 
incorrect exposures.

For instance, while the polarizer has a neutral density of about a 
stop, it affects polarized light far more than one stop. If the sky 
is what you are darkening with the polarizer, you need to know it's 
value through the polarizer in the position it will be in when the 
image is made.

In order to really know the effect the polarizer is having with this 
type of camera, you must have a circular polarizer.


Peter Jon White