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>
OM Tyro - please point my lens in the right direction.
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