Dan,
I think Lars Bergquist gave you satisfactory answer. However,
I am not sure how to identify that you have LINEAR or CIRCULAR
polarizor from your post. I have two circular polarizors - one
by Hoya and other one by Kenko brands (both glasses are produced
by Hoya glass - which is a separate subject). 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).
Like Lars indicated, I normally do not use pol filter on wide
angle lenses - causes vignetting due to extra physical thickness
of the filter when added onto the lens. Hoya recently (in past
4 months or so) introduced this 'Super MC PL' filter which
physical thickness is much less, hence less vignetting.
I use pol filter for not only to cut the glare, but also to
take advantage of wider aperature opening (sort of semi-ND
filter usage).
Regards,
Jim Terazawa
>
> I got a filter that is attached to a Zuiko lens I acquired,
> and I'd like to identify it. It is not the normal 1A or UV
> or Haze/Skylight filters found on most lenses but is a little
> darker. It rotates freely with a separate mounting collar.
> The markings on the edge are:
>
> V Hoya PL 49 Japan
>
> Where the "V" is a triangular arrow. "49" obviously refers
> to the size. And I don't know what the "PL" means.
>
> My guess is that it is a Polarizing filter, and if it is, since
> I have never used one before, I have the following questions:
>
> 1) Is it OK to leave a Polarizing filter mounted at all times
> on the lens, does it hurt anything? Or should I replace it
> with a 1A and mount it only when I need it?
> 2) I know the Polarizing filter can be used to cut out glare,
> but how do I use the arrow for proper orientation?
> 3) What are the other situations to use the Polarizing filter?
> 4) Any advice on using the Polarizing filter with flash? How
> well does it cut out the reflections from shiny surfaces?
>
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