Just to demonstrate the difference a CP can make, check out the two images of the same scene. The only difference was i rotated the CP for the second image.
http://www.aphexii.com/pics/cp.jpg
And the rest, all taken today with my Nikon D70 w/ 18-200vr and my new B+W 72mm MRC Kaesemann circular polarizer filter...
http://www.aphexii.com/pics/bird4.jpg
http://www.aphexii.com/pics/bird3.jpg
http://www.aphexii.com/pics/bird2.jpg
http://www.aphexii.com/pics/bird1.jpg
http://www.aphexii.com/pics/bay1.jpg
http://www.aphexii.com/pics/bay2.jpg
http://www.aphexii.com/pics/car1.jpg
http://www.aphexii.com/pics/sq1.jpg
http://www.aphexii.com/pics/cp.jpg
And the rest, all taken today with my Nikon D70 w/ 18-200vr and my new B+W 72mm MRC Kaesemann circular polarizer filter...
http://www.aphexii.com/pics/bird4.jpg
http://www.aphexii.com/pics/bird3.jpg
http://www.aphexii.com/pics/bird2.jpg
http://www.aphexii.com/pics/bird1.jpg
http://www.aphexii.com/pics/bay1.jpg
http://www.aphexii.com/pics/bay2.jpg
http://www.aphexii.com/pics/car1.jpg
http://www.aphexii.com/pics/sq1.jpg