Polarizer Circular Polarizing
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what kind of polarizing filter is used in 3D IMAX, the lenses on the projector and glasses people wear?
I'm seeing a lot of info about linear because it's less expensive and time consuming to produce than circular, but I don't know a lot about the differences either. I guess it could also be for any 3D movie since I don't think the cinema industry really puts weight on one type, but I could be wrong.
I also read that the polarizer is cut at 45deg. but don't know why.
They use linear polarizers. The angle at which they're set isn't as important as the fact they're out of phase to one another by 90°. And in-phase with the projected image.
Linears are considerably cheaper to produce - we only got circular ones after the advent of autofocus/exposure systems in cameras. They were confused by the single plane of light coming into the camera.
The glasses will not be okay for any 3D movie. Some use circular pols, some linear, and some still rely on color separators.
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