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The effects of a circular polarizer on a computer monitor.
The first angle is how a camera would normally look through it, the second is flipping it around so it's "backwards"
Fun fact, LCD's put off polarized light, which is why this works.
The effects of a circular polarizer on a computer monitor.
The first angle is how a camera would normally look through it, the second is flipping it around so it's "backwards"
Fun fact, LCD's put off polarized light, which is why this works.
Category Flash / All
Species Unspecified / Any
Size 1280 x 720px
File Size 3.23 MB
IIRC, most circular polarizers have a straight polarizer on one side. So when the circular faces the monitor, it wouldn't exclude all light? It's always going to allow some through since the polar light will rotate through the circular polarizer. I think.
This is assuming that filter is from 3d glasses or similar.
This is assuming that filter is from 3d glasses or similar.
This is the answer here. A typical circular polarizer usually consists of a linear polarizer sandwiched together with something called a quarter-wave plate. If you put polarized light into the linear polarizer first, it will act like a normal linear polarizer, blocking if they are 90 degrees out of alignment, and letting everything through if they are aligned. The QWP won't do much visually to what makes it through the linear polarizer, although it makes it circularly polarized. If you go the other way, the QWP will circularly polarize it regardless of alignment, removing most of the linear polarized light. Then when it goes through the linear polarizer second, that removes part of the circularly polarized light turning back to linear, but the angle of what came in from the monitor won't matter.
Quarter-wave plates are wavelength dependent, as they need a thickness that slows down part of the light by a certain amount. So you can get some color changes depending on what angle you hit it, as the light will be going through slightly different thickness of the material. Stuff that is not the exact wavelength with not be completely circularly polarized, so gets filtered slightly differently by the following linear polarizer.
If you are dealing with light you know is already polarized, you don't need the linear polarizer, and just use a QWP to make circularly polarized light, or to turn circularly polarized light back into linear polarized light. There are some neat combinations with polarizing splitting cubes and using QWP, or another thing called a half wave plate, to make light go in one way then come out another way of a device, that comes up in laser and interferometer designs.
Quarter-wave plates are wavelength dependent, as they need a thickness that slows down part of the light by a certain amount. So you can get some color changes depending on what angle you hit it, as the light will be going through slightly different thickness of the material. Stuff that is not the exact wavelength with not be completely circularly polarized, so gets filtered slightly differently by the following linear polarizer.
If you are dealing with light you know is already polarized, you don't need the linear polarizer, and just use a QWP to make circularly polarized light, or to turn circularly polarized light back into linear polarized light. There are some neat combinations with polarizing splitting cubes and using QWP, or another thing called a half wave plate, to make light go in one way then come out another way of a device, that comes up in laser and interferometer designs.
Oops, too early in the morning and didn't pay attention to what I was writing, a QWP is alignment sensitive, and there are two directions along which it will mostly let light through without changing the polarization, but depending on how those line up with the linear polarizer, you might not notice much.
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