Okay, for added clarity I will post this shot too.
This shot did not have a polarizer on the lens, nor a UV filter. I suggest avoiding UV filters on digital for optimum quality--my 2 cents. Anway, this shot is done on Full-frame sensor, with the 17mm Tamron f/3.5 Adaptall lens. Look at the deformation of color uniformity, ie, the left side of the frame has a much lighter blue than the right side. However, this has nothing to do with a polarizer; rather, it has everything do so with the composition's proximity to the Sun. In other words, the Sun is directly to the left of the composition, just outside of the most left portion of the shot. 17mm on FF is close to 11mm on APS-c.
JT
This shot is @ f/3.5, or wide open on the Tammy adaptall.