jerryc41 wrote:
Yes, it does meter through the lens. The CPL does decrease the light a bit. The polarizer works best when shooting at 90 degrees to the sun to reduce reflections and increase color saturation. It's not an all-purpose alway-on filter/lens. If you can post a shot with the filter and another without, we can tell you more. Click "(store original)" so we can examine them in more detail.
Too bold a statement about the "90 degree angle" syndrome. That is ok for darkening the blue sky, to improve clouds, but not for reflections from shiny surfaces. Too many folk fall for this 90 degree hackneyed comment. The optimal angle from camera to subject surface, is approximately 30 degrees. Shop windows, automobiles, shiny leaves. water surface, etc. etc. Check text-book physics if you need to.