P3D Re: active/passive viewers

[fj834@xxxxxxxxxxxxxxxxxxxxx (Dr. George A. Themelis)]

>No, they're not. A reputable dictionary will inform you that "optically active"
>refers to the ability of certain substances to rotate the plane of polarization
>of an incident beam of polarized light. For shame, sloppifying the definition
>of an existing technical term, in the midst of a lecture on correctness of
>terminology! :-)

Thank you John! I was thinking that "filtering" is some kind of action
and did not know that "optically active" carries a special meaning.  
As a matter of fact, the previous poster just dropped a reply from personal 
correspondence into photo-3d.  I was wondering about the choice of 
terminology here.  I wanted to know if there was a reason for the choice 
of these terms.  Apparently, the other poster did not know of any particular 
reason, other than some authority that has used them.  Now, thanks to you, 
I know better. 

-- George Themelis


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