It appears this thread has taken a life of its own. How many stops of light the circular polarizer reduces isn't relevant to me because I only need a linear polarizer. I am using manual focus lenses and setting my video camera to manual focus and manual exposure (as anyone half-serious about film does). It's true that I'm mounting my Minolta lenses on top of the camera's inbuilt lens via an adapter but as I don't require the use of the camera's autofocus or metering systems, I do not require a circular polarizer. Correct?
I'm deciding between the Hoya, B&W I previously listed and this Heliopan:
Gotta tell ya..I'm still tempted to go with Hoya..