Is the Olympus polarizer a circular, or a linear?
I'm putting together a light travel kit with an OM-2S body. It occurred to
me that I could be making a opps! packing the Olympus polarizer.
Bill Stanke
----- Original Message -----
From: "Roger Wesson" <roger@xxxxxxxxxxxxxxxxxxx>
To: <olympus@xxxxxxxxxxxxxxx>
Sent: Friday, December 19, 2003 9:14 AM
Subject: Re: [OM] 24mm and polariser
> Not sure a circular polarizer would make any difference - as I
> understand it, it's a linear polarizer with a quarter-wave slice of
> glass behind it which effectively 'de-polarizes' the light, so it
> doesn't affect camera metering systems - but the pictorial effect should
> be identical to a linear polariser.
>
> Light from the sky is most polarised 90 degrees away from the sun, and
> least polarised opposite the sun in the sky, so lenses with a field of
> view much greater than 90 degrees will show the variations in sky light
> polarisation quite strongly, pretty much wherever they're pointed. Only
> way to avoid the effect is not to use a polarizer, I think. Velvia
> hardly needs a polariser to give you deep, deep blue skies, so using
> that could be the best suggestion.
>
> Roger
>
> Piers Hemy wrote:
>
> > I think Bill did a good job of explaining the theory James, so I won't
> > repeat it. But I will suggest that you try a circular polarizer against
a
> > linear polarizer, because it *may* have a less pronounced effect. I do
not
> > recall ever seeing banding with a 17mm using a circular polarizer - but
> > maybe I either wasn't looking, or didn't have the scene framed so as to
> > include the banded area^. Best UK price I have found on circular
polarizers
> > is at Denton Photo Optics - they advertise in AP.
> >
> > Piers
> >
> > ^ Though I tend to have too much sky rather than too little - the reason
for
> > having the 17mm.
> > NB "the reason for" not "the result of" ;-)
> >
> > -----Original Message-----
> > From: owner-olympus@xxxxxxxxxxxxxxx
[mailto:owner-olympus@xxxxxxxxxxxxxxx]
> > On Behalf Of James Royall
> > Sent: 19 December 2003 15:24
> > To: olympus@xxxxxxxxxxxxxxx
> > Subject: [OM] 24mm and polariser
> >
> > I finally have a 24mm 2.8 in my possession after about four months of
> > various problems. I'll be getting to grips with it over the holidays
during
> > the 8 hours of light that we get at this time of year in the UK (I'm
sure
> > it's a lot more than some on the list, but still seems mighty short to
me -
> > do we have anyone north of the Arctic Circle?). I seem to remember
someone
> > saying that polarisers can be problematic with this focal length as
enough
> > sky can be captured that the darkening of the sky is seen as a band,
rather
> > than a uniform effect. Is this right?
> >
> > James
> >
> >
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>
>
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