Which level of yellow filters for B&W?

[MattKing]

Just kidding, no filter.

Sounds like a good subject for a thread

 

[Sirius Glass]

The trouble with a polariser is the wide(-r) angle lens...

Yes, polarizers on very wide lenses such as a 21mm lens will make weirdly colored skies.

 

[Philippe-Georges]

Yes, polarizers on very wide lenses such as a 21mm lens will make weirdly colored skies.

Which happens in B&W too: strange smudgy like streaks in the sky (and reflexions in the water).