[OM] polarizing filter and wide angle lenses?

[christian]

Hello to all, 

I am questionning about polarizing filter and wide angle. 

Is it possible to mount a polarization filter on a 21/3.5 lens 
(angle of view ~91°) ? Any vignetting ? 
I saw WA polarization filter in a shop 
at a good (not for me) price (but not any
advice  from the seller). 

What do you think? has anybody tried ? 

Thanks.

Christian

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