Hej Jan!
Følgende uddrag er fra
http://www.luminous-landscape.com/polarizers.htm
En iøvrigt glimrende side - kan anbefales.
----------------------------------------------------
Circular Vs. Linear Polarizers
There are two types of polarizing filters available - linear or circular. Linear polarizers are more
effective and less expensive than circular ones. But circular polarizers are needed with just about
any camera that has a through-the-lens metering system, or autofocus.
The reason for this is that both of these systems use semi-silvered mirrors to siphon off some of
the light coming though the lens. If that light is linearly polarized it renders either the metering
or the autofocus ineffective. This means that you're going to have to buy circular polarizers unless
you're shooting with a pre-1970's camera, or a view camera.
----------------------------------------------------
Mvh Morten
<Jan Petersen> wrote in message news:3cbbbe36.329654109@news.kmd.dk...
> Hej,
>
> Er der en som kan forklare mig forskellen på et cirkulært og et
> liniært pol-filter??
>
> Mvh Jan
>