I believe the circular polarization of that filter was to keep unwanted
harsh reflections from flat stock/printed media from being an issue.
Don't remember now where I read/heard that, but it makes sense.
-----Original Message-----
From: olympus-owner@xxxxxxxxxx [mailto:olympus-owner@xxxxxxxxxx] On
Behalf Of Piers Hemy
Sent: Thursday, July 13, 2006 12:41 AM
To: olympus@xxxxxxxxxx
Subject: [OM] Re: Filters for T-10
Yes, I think he is using it that way - but I think he also reveals why
the polarizers are not linear when he says "The filter ... does not
require rotating for best effect". If they were linear polarizers, you
would have to align them to avoid the undesired reflections - but you
could only do that when the flash fires (the modelling lights are not of
the same intensity as the flash tube). My reaction time is not what it
was!
--
Piers
-----Original Message-----
From: olympus-owner@xxxxxxxxxx [mailto:olympus-owner@xxxxxxxxxx] On
Behalf Of Walt Wayman
Sent: 13 July 2006 00:21
To: olympus@xxxxxxxxxx
Subject: [OM] Re: Filters for T-10
Well, now that I've copied it and posted it, upon re-reading, I'm
starting to wonder if he's using the word "circular" in the sense Piers
first thought I was. It is definitely round.
Walt
--
"Anything more than 500 yards from
the car just isn't photogenic." --
Edward Weston
-------------- Original message ----------------------
From: hiwayman@xxxxxxx (Walt Wayman)
> This is from the Carl Shipman book, revised edition, 15th printing,
> 1989. Helps a little, confirms that it is indeed circular, but doesn't
say
why.
>
> "Ring Cross Filter Pol -- This special accessory for the T10 Ring
> Flash is used to suppress reflections of the ring-shaped light source.
> It is two filters in one. The center part is a circular polarizing
> filter that fits over the camera lens. The outer part is a ring-shaped
polarizer that fits over the ring flash.
> The filter screws into the lens and does not require rotating for best
effect.
> The two parts are permanently mounted in relation to each other for
> maximum reduction of reflections."
>
> Walt
>
> --
> "Anything more than 500 yards from
> the car just isn't photogenic." --
> Edward Weston
>
> -------------- Original message ----------------------
> From: "Piers Hemy" <piers@xxxxxxxx>
> >
> > And I agree too - mine is "clearly" not linear, but cirular with the
> > two portions at 90 degrees to one another. I also was surpised - in
> > fact Walt, I owe you an apology as I assumed your one word response
> > was a play on words. It might have been, but it was also correct!
> >
> > --
> > Piers
> >
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