Help with B+W CPL Filter

I just bought one of these filters and it arrived the other day... Playing around with it is a ton of fun, but my question is... When it's being used, it's most effective at a 90* angle from the sun, correct? Now, when you rotate the filter element, the severity of the polarization is changed. When people talk of being 90* from the sun, does that mean the object you are shooting (so the sun would be directly to your left, or right), or a 90* angle from the polarization of the filter? (in such, you would rotate it to be most effective). Now in the case of B+W, they have two little notches in the filter, are those notches the direction of the polarization? Or just a random assembly thing?

Just want some basic know-how of using these filters. I seem to do good with it, but it's more playing around with it versus setting up properly then shooting.

Thanks!

You seem to have it down. A good way to think of the 90-degree thing is to have the sun pointing at either of your shoulders when you're looking at the subject through the VF. One other tip: when looking through the VF, rotate the CPL in a counterclockwise direction...this will prevent your expensive CPL from inadvertently loosening and falling to the ground. Other than that, there's not much to using one...simply rotate it until you achieve the effect that you're looking for in the VF.

Thanks for the help! Also for the tip on which to rotate... I noticed that it will loosen sometimes when rotated, not good!