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I'm afraid that collecting "extra" glasses after the show is stealing. My daughter works part time for IMAX and the glasses are an incredible expense for them. They have to be collected by staff after each show (although some people hide them and sneak off with them), sterilize them, and then hand dry them so there will be no streaks or spots. They are of no use as polarizing sun glasses. As you noted, the polarization is not in the vertical plane so they will not serve to reduce glare the way that traditional polarized sunglasses do.
... I would highly recommend the movie - great fun and the best 3-D so far. Definitely see it at an IMAX theater if possible.
At first I wondered why circular? Perhaps, so tilting head doesn't affect the 3D and if the screen is tall / wide also?
When I Disneylanded, I kept the glasses to use w/ my 3D projector (father's, and grandfather's glass slides from, ca 1903 to 1935). They are simple linear polarizers. I'm also surprised broad spectrum circular polarizers can be made cheaply. Are they not 1/4 wave plates w/ a lin. polarizer?
Pleased you're back --