Ian,
I think someone already explained about what circular/linear polarizers are
constituted of. Basically one fixed glass that allows to pass a flux of
light in certain angle and the another rotatable glass that allows to pass
separate flux of light in different angle (sorry for the poor explanation).
The 'V' mark on the roatating collar is useful when finding the maximum
polarizing angle viewing with your eyes. This situation is not applicable
to single lense reflex with pentaprism (slr cameras) but is useful if
using on the range finder cameras where light polarization cannot be verified
through the viewfinder - I read the instruction sheet provided with the
MC PL-CIRCULAR FILTER by Kenko last night.
Regards,
Jim Terazawa
>
> Jim Terazawa wrote about: Identifying a filter and how to use it
>
> <snip>
> >. The reason I can
> > tell they are circular pol is that they are inscribed "PL-C" on
> > the rotating collar (also they came with little 'instruction
> > manual' such as explaining how to use "V" triangle marker on
> > the collar - sorry I don't have the manual with me).
>
> I don't understand this (perhaps because I don't yet have a
> polarizing filter). I thought that the idea of a 'circular'
> polarizer was that there is no need to rotate the thing, and
> therefore it can be screwed on to the front of a zoom or whatever?
> If so, then why is there a triangle mark and instructions about
> rotating it?
>
> Sorry if I'm being dumb.
>
> --
>
> Ian <IMS>
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