P3D Polafusion

[Bob_Maxey@xxxxxxxxxxxx]

>    There is a lot on confusion today about the two kinds of polarizers
>now on the market - Linear polarizers (before about 1980 merely called
>polarizers) and Circular polarizers.  Both usually come in round frames.
...   [then, on "circular polarizers"]:
>These filters to nothing of the sort.  A circular-polarized filter is
>actually a linear polarizer with a quarterplate (a depolarizing layer)
>behind it.  Perhaps a more correct term would be "polarizer-depolarizer



Actually, the so called 'quarterplate' does not depolarize the polarized
light. It changes the vibration direction and causes it to move in a
helical pattern. There are different versions of these retarders; quarter
wave and half wave to be specific. The 'quarterplate does not depolarize
light, it simply changes the 'Spin'; for lack of a better word.

RM



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