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
Date: Wed, 30 Sep 1998 15:06:59 EDT

In a message dated 9/30/98 2:00:50 PM EST, 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.