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Bill,

>"Are your filters of the newer circular or the traditional linear variety?

>If traditional linear, I am not clear why one filter has to be flipped.
> Isn't just a film sandwiched between two pieces of glass?"

I have several sets of both circular and linear polarizers. The linear polarizers work as variable filters in all four orientations. The circular polarizers only work as a pair in one of the four orientations. If a circular polarizer is paired with a linear polarizer then two of the four orientations works. I have a set of both types right here in front of me to verify this. If you have a pair of circular polarizers then it will be necessary to find the right configuration. It will may mean removing the polarizer from the frame and flipping it over. A good tool for this is a pair of dividers.

Greg Rudzinski

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