This shows how we mount our polarizing filters to our GeoWall. The filters are "3x3 Polarizers" (stock #7503) from http://www.stereoscopy.com/reel3d/projection.html.
Select any picture to zoom in.
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After many difficulties with filters attached directly to the projector lenses, we asked our resident fabrication expert to build a filter holder, and here's the result. |
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This shows the filters positioned in front of the projectors. You can focus or zoom the lenses without knocking your filters out of alignment. Hooray! |
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The holder keeps the filters several inches away from the hot projectors, which should help the filters last longer. |
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