Archived posting to the Leica Users Group, 1999/01/27

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Subject: Re: [Leica] Re: Polarizing Filter
From: Tina Manley <images@InfoAve.Net>
Date: Wed, 27 Jan 1999 18:18:46 -0500

At 02:24 PM 1/27/99 -0800, you wrote:
>The clerk is absolutely totally wrong. The partial silver reflector that
>directs the exposure light to the photocell within the R cameras acts like
>a polarizer. Pitting a linear polarizer on your lens will block most, if
>not all of the light from getting to the cell, thus giving you an improper
>reading. All Leica R cameras REQUIRE a circular polarizer. That's why Leica
>makes them.
>Some autofocus systems require a circ polarizer, some don't.

Thanks, Jim.  I had no idea.  I guess I should take a deep breath before I
reply.  I used to teach in my classes that circular polarizers were only
necessary for autofocus lenses; however, since I don't use them myself, I
shouldn't have jumped in to answer.  It would be nice if the cheaper linear
polarizers would work on Leicas!  Stick with black and white and use M's
and you won't have to worry about filters!


Tina Manley, ASMP