Archived posting to the Leica Users Group, 1998/09/30

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Subject: Re: [Leica] How to use screw-in filters with an M camera
From: jimbrick@photoaccess.com (Jim Brick)
Date: Wed, 30 Sep 1998 14:57:31 -0700

When my Gossen F2 reads a polarizer at max effect, it very consistently
sees it as 1.8 stops.

Jim

At 03:06 PM 9/30/98 -0400, you wrote:
>In a message dated 9/30/98 2:00:50 PM EST, aghalide@panix.com writes:
>
>> You can do the two-filter deal with all M cameras, but only with
>>  the through-lens meter ones can you also adjust for exposure due
>>  to increased filtration density. How do people do this QUICKLY.
>>  Ed
>                      The problem with a polarizer is that the light-loss
>(filter factor) is continuously variable throughout the rotation of the
filter
>as it darkens progressively the more pronounced the polarization effect
>becomes.  With either a 2-filter or a flip-out filter, the best way I've
found
>is to rotate the filter to the point I want, and then put the cell of my
>handheld meter right up to the filter and take the reading through it.  If
>your're "guesstimating" exposure, it's usually between 1.5 and 2 stops
>depending on the amount of polarization.
>
>Jay
> 



Jim Brick
(650) 470-1132

http://www.photoaccess.com