Re: outdated glasses? (longish)

[P3D <klein@xxxxxxxxxxxxxxxxx>]

On  3 Sep 97 at 14:58, P3D Gregory J. Wageman wrote:

> Steven Lederman wrote:
> 
> >I recently won a box of old polarized glasses from the '50s [...]
> >I set up my FED projector, and put in a slide. LUNCHBAG LETDOWN!!!
> >No stereo effect! [...]  I then put on a pair of the FED glasses, and
> >WOOOOAAAAHHHHHHHH!!! The person's foot in the picture leaped out and
> >almost kicked me in the face!!  My question to the group; do the
> >polarized lenses in the projector and the glasses have to match?
> 
> This is a more complicated question than it may at first seem.  Yes, the
> polarizers in the projector and the glasses must "match".  There are two
> ways in which they must match: the type of polarization (linear vs.
> circular), and, if linear, in the angle of orientation.
> 
> The most commonly-available polarizing glasses use linear polarizers,
> with the axes of polarization being 90 degrees to each other (obviously),
> and at a 45 degree angle from vertical, like this: \ /.

The original polarizers in the FED-Projektor "ETUD" are linear, but they 
are not at a 45 degree angle ("V"), but horizontally and vertically ("+"). 
Just replace the polarizing filters (located in the slide-carrier) with 
standard "V" oriented ones and you're back in business and can use any 
"standard" polarizing glasses.


Alexander Klein
3D-Magazin, Editor (http://www.stereoscopy.com/3d-magazin)
Webmaster: http://www.stereoscopy.com


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