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