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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