Only the OM2S and up need a circular polariser, and then only for accurate
manual or spot exposure readings. It's because the semi-silvered mirror,
which lets some light through to go to the exposure meter, polarises the
light, letting more or less through, depending on the light's polarisation.
So with a linear filter at the right angle, no light would reach the meter,
and at 90 degrees to that, too much would.
Side note: Exposures through the circular polariser are actually more
accurate than with no polariser, since it removes all polarisation from the
lite coming thru, even that of the light from the scene. Try looking
through your circular polariser backwards towards a glass reflection and
rotating it - no effect!
tOM
On Tuesday, March 05, 2002 at 16:15, Henrik Dahl <olympus@xxxxxxxxxxxxxxx>
wrote re "Re: [OM] Polarizer question" saying:
> The answer seems to be "yes".
> Thanks Jim, Steve and John.
> I found an old linear in my desk, so now I won't have to switch as often
> between body/lens setups.
>
> Thanks
> Henrik Dahl
>
>
> > Is the meter in OM-1n of the kind that one can use a linear polarizer with
> > it, or does it like the others need a Circ-Pola?
> >
> > Henrik Dahl
>
> >> Linear should work fine.
>
> >>> Yes. The M-1, OM-1, OM-1n, OM-2, and OM-2n are all
> >>> compatible with linear polarizers. The OM-2s, 3's and
> >>> 4's are not. I'm not sure about the two digit models,
> >>> but I'm sure multiple someones else are.
> >>
> >>>> Linear is OK for OM1/1n/2/2n
> >>>> Circular is only required for spot-metering AFAIK
> >>>> I'm sure others will give more detail or even tell me I'm wrong!
--------------- http://groups.yahoo.com/group/Olympus-Documentation
tOM Trottier, ICQ:57647974 http://abacurial.com
758 Albert St, Ottawa ON Canada K1R 7V8
+1 613 860-6633 fax:231-6115 N45.412 W75.714
"The moment one gives close attention to anything,
even a blade of grass, it becomes a mysterious,
awesome, indescribably magnificent world in itself --
Henry Miller, 1891-1980
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