----- Original Message -----
From: "Geilfuss Charles" <Charles.Geilfuss@xxxxxxxxxxxxxxxxx>
To: <olympus@xxxxxxxxxx>
Sent: Thursday, 30 June, 2005 09:54 AM
Subject: [OM] Re: Questions about polarizing filters
>
> Gary,
> 1) No exposure compensation is needed as both these cameras meter through
the lens and thus through the polarizer.
It is useful to know that a polarizer has a filter factor of 2.5 which
translates into an increase in exposure of ~ 1 and 1/3 stops. This increases
applies regardless of the degree of orientation of the of the filter.
>
> 2) A circular polarizer can be used on any OM, but is only "needed" on the
models with 1/2 silvered mirrors (2SP, 3, 4). I say "needed" because these
cameras will expose properly with either the circ. or linear polarizer but
will give an incorrect meter value in the viewfinder if used with the
linear polarizer.
>
> 3)Neutral density (if you forget and bring the high speed film). That sand
down there is really white.
Another point is that the degree of polarization is the greatest when the
lens axis is 90 degrees to the sun.
>
> Charlie
>
> -----Original Message-----
> From: olympus-owner@xxxxxxxxxx [mailto:olympus-owner@xxxxxxxxxx]On
> Behalf Of Gary Teller
> Sent: Thursday, June 30, 2005 8:05 AM
> To: olympus@xxxxxxxxxx
> Subject: [OM] Questions about polarizing filters
>
>
> In a couple of weeks I'll be vacationing in the Florida Keys. Hopefully
> there'll be plenty of sunshine and blue/green water. It occurred to me
> that I might want to take polarizing filters. I've never really used
these
> filters and want to know:
>
> 1: How much, if any, exposure compensation do I have to make using an
> OM1-N and OM2 with 100 speed color print film?
>
> 2: When would I want to use a circular rotating PL filter as opposed to a
> fixed one?
>
> 3: Any and all filter suggestions welcomed.
>
> By the way, do any list members live in Key West or any of the other Keys?
>
> Thanks,
>
> Gary
>
>
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