Filter Question

[skrott]

Using a polarizing filter should you white balance before you attach the fillter or after the filter is in the Matte Box

 

[ryan brown]

After. Always white balance RIGHT before shooting.

 

[ben-s]

Unless you are using a coloured filter for effect eg. a coral grad, you should white balance after fitting your filter.
If you WB through a light coloured filter, you just lose the effect of that filter, because the WB system balances the effect out.

Any neutral coloured filter should be attached before WB takes place.

So, the short answer to your question is as rcbrown32 said - WB after fitting a polariser.