Archived posting to the Leica Users Group, 1996/06/12

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Subject: Re: Swing-out polarizer
From: Wolfgang Sachse <>
Date: Wed, 12 Jun 1996 19:14:37 -0400 (EDT)

> You have to realize the way a polarizer works is not going to give you a
> uniform effect. The reason is, the amount of polarization differs depending
> on how far off axis from the light source you are looking....

	Hi Group -

	Right, sort of. What Eric is saying holds true for naturally
	occuring polarized light.

	The way to check this polarizer is to use the light from
	a cloudy sky or from a diffused light source, put a
	linear polarizer in front of your camera polarizer.
	Now you can test your polarizer to your hearts content.

	You can get a linear polarizer from Edmund Scientific
	for a couple of dollars. Or use one lens from a pair
	of polarizing sunglasses.

	You could also use circular polarizers. But I have to
	think about this a bit longer, whether the orientation
	of the polarizer axis (normal to the polarizer) would
	matter. Does anybody know whether the Leitz polarizer
	is a circular polarizer or a linear one?

	-- Wolfgang

|                    Wolfgang Sachse   Phone: +1/607/255-5065              |
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In reply to: Message from Eric Welch <> (Re: Swing-out polarizer)