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Compco Triad Projector

>> Another approach which will even allow the projection of PolaColour
>> slides (which de-polarize light themselves) is to place the polarizing
>> filtres AFTER the slide in the light path, where they belong (!)
>
>Which is what the Compco Triad projector does.  Maybe others as well.
>Mike K.

Yes.  This fine porjector (Compco Triad) also works better than other 
projectors with the Dukes Projection Previewer because of the wider range 
in lens spacing.  Darn it!  I just sold mine! -- George


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