Floyd wrote:
I probably should know this by this late time, but I don't; therefore, when using a CP filter should I be able to look through the viewfinder and see the effects of turning the lens? I have, somewhere, back down the line, purchased a Hoya CP and in the camera's, viewfinder I cannot tell any difference in sky, etc. when twisting the lens even after taking the same picture with and without the filter.
Try setting the camera to manual and then turning the polarizer. That locks in the exposure so it cannot change with the reduction of reflected light by the polarizer. Once the polarizer is set, change back to the mode you want for shooting. I find the same problem with my camera because as the highlights are brought down, the shadows are bought up exposure wise. This changing exposure makes it much harder to judge the actual changes to the sky.