This is a bit speculative - all my polarizing filters are linear (OM-1 and
OM-2 user).
A circular polarizer is a linear polarizer with a second element (a quarter
wave plate ?) on the output side. The light passing through the front
element (the linear polarizer) is linearly polarized, then it is
"de-polarized" by the following element - or maybe the correct term is
"...it is circularly polarized...."
If you place one linear polarizer in front of a second linear polarizer, you
should be able to completely block all light passing through the two filters
- when the polarization axes are perpendicular to each other. On the other
hand, I would think that if the first polarizer (the one farthest from your
eye) is a circular polarizer, then you should not get a complete null when
you rotate the two polarizers relative to each other.
/Dave
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