wide angle lens and circular polarizer filter

[mare]

I need a circular polarizer filter for my zeiss distagon 21 mm. Is there any sutable filter for it. I am afraid of some strange efects.

[graham_c]

Hi. I have a sigma 10-20 wide lens and i use a thin polariser on it with no problems. Only bad thing is they cost a lot more...graham

[graham_c]

Just had a thought i use a hoya hd c/ polariser filter on my 18 -55 and it is a normal thickness

[mare]

Problem is unevenly polarization. Sky can be on one part on pictures blue on the other side dark+black.

[mare]

By the way what about a problem with a cap (falling out) with slim filters. Any experineces with B+W XS-PRO CLEAR MRC

[graham_c]

Hi what sort of c/ polariser are you using?. Sorry haven't had a cap problem... graham