Frank Skomial , Dec 05, 2005; 12:03 p.m.
You have already answered yourself. Perhaps there is no 1 clear answer for all circular or linear polarizers.
Why? Even some circular polarizers do not work well, e.g. one made by Prinz in Korea. So, you need answers for each filter make and type you use. Some linear polarizers defeat camera metering with some lenses and not with others (?). D50 is pretty good at metering, so you have better chance with filters, but could not tell that in general for all filters out there, even if circular.