Thanks for the comment. Yes, I turned the CP. I turned and looked from the view finder until it looks even. However, the result is not so. I used it to remove reflection from water and it's obvious on view finder when it's the right rotation. Can you advice any technique or how to judge from the view finder for sky shoot?
Aiya Esther that actually a newb take, my first trip overseas after i bought my then spanking new D80.
I blundered a few shots taken wide with a CPL because of overzelous use causing uneven polarisation. Actually it is not too easy to see through the viewfinder how uneven it gets ( and I was too lazy to check the camera LCD ) . Nowadays i usually use it on the less wide focal lengths when I want to polarise the skies.