And it can only screw in one way!
tOM
On Monday, August 26, 2002 at 12:36, John A. Lind <olympus@xxxxxxxxxxxxxxx>
wrote re "Re:[OM] Filter recommendations for " saying:
> At 08:03 8/26/02, Pete wrote:
> > >Oh, and is there any harm in using a circular polariser with
> > >my OM-2 since the Nikon (with auto-focus) requires it?
> >
> >No harm, except that you will have to pay attention to the
> >orientation of the polarizer each time before you shoot. This
> >is a minor detail. By the way, the best filters are multicoated
> >(PMC) Heliopan.
> >
> >Pete
>
> Use it just as you would a linear. I'm puzzled by "except that you will
> have to pay attention to the orientation." Using a circular is no
> different from using a linear; they're both the same in that regard.
>
> The only difference between the two is a circular has a quarter-wave plate
> cemented to the back side of the linear polarizing plate. The linear in
> front behaves the same in both. The quarter-wave plate circularly
> polarizes the (now linear polarized) light that survives filtering from the
> linear plate. To a half-silvered mirror (which is a form of linear
> polarizer), circularly polarized light is effectively the same as randomly
> polarized light. To a full-silvered mirror (OM-2[n]) linear, circular or
> random makes no difference.
>
> -- John
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