I was thinking of getting a polarized filter for my D50. I knwo that the way you orient it matter, however, I dont know which way it should go? horizontal or perpendicular? Also, I understand that there are a lot of situations to use it for reduced glare and such, but is there any reason to remove it? How many of you guys actually use one? As you can tell, I really dont knwo if I should get it or not, but it seems like a cheap enough thing to have.