If the sky's nice and blue where you are you can easily find out - a
linear polarizer has the same effect on the sky (and any other polarized
light source) whichever side you look through, but a circular polarizer
will only work from one direction. Strange but true!
Roger
> -----Original Message-----
> From: Jerry Smith [mailto:proudtexan63@xxxxxxxxxxx]
> Subject: [OM] Polarizers
>
> Hi all,
> How do you tell the difference between a circular and linear polarizer
> filter? I bought a used Tiffen, a while back, but didn't know there was a
> difference at the time.
>
> Thanks,
> Smitty
>
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