On Sun, 16 Dec 2001 00:27:14 GMT, cindy@nospam.net (Cindy Garrison) wrote:

>Sorry to confuse everybody. A straight polarizer has polarizing lines
>straight across. Turning the lens cause different degrees of
>polarization. Like you did in your 35mm days.
>
>A circular polarizing filter has polarizing lines in concentric
>circles. Turning the filter has no effect, but it is not possible to
>vary the effect of the lens.
>
>Century sells polarizing filters made by Schneider for their lenses. A
>series 9 for the single filter shade they make for their .65 wide
>angle converter runs about $170, list. A straight polarizer.
>Century doesn't really have sales people, but the person said that the
>PD150 doesn't need a circular polarizer. Perhaps the issus is whether
>the lens turns the filter.
>
>However, more than that, since the video camera is moving, not sitting
>still like a still camera, it is quite possible that a straight
>polarizer will have unwanted changes that affect the image, such as
>with a dolly, scoop, roll-tuck and pan shot (as when following a stunt
>plane).
>Maybe noone uses polarizers since all the key lights are not soft.

It does appear that you, and others, are confused about
what the difference is between a "linear" polarizer and a
"circular" polarizer - and why one should choose between
them...;-) They are identical in function (assuming equal
construction of the linear polarizing parts of both...)
in that they will show identical polarization effects on
tape/film, and are used in the same way on various types
of gear - with the exception that some AF systems, and
some metering systems, are sensitive to the polarization
direction of the light and will err with some rotation
angles of the linear polarizer. The "circular" type has
a rear part that "mixes-up" the light orientation to
make the directions again mostly random, for the benefit
of devices that need that... In practice, though, I have
found that linear polarizers work well enough on all the
camcorders I've tried them on (but I still own, and
sometimes use, circular polarizers...;-).