Nisi 150x150mm Square HD Polariser filter

3 years 6 months ago #620466 by George Winters
Can someone explain how in the world does a square polarized filter work?  I might be wrong, but this doesn't look like it can spin?


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3 years 6 months ago #620474 by garyrhook

George Winters wrote: Can someone explain how in the world does a square polarized filter work?  I might be wrong, but this doesn't look like it can spin?


You're thinking of a circular polarizer, which just changes the direction.

Think of a polarizer like a wooden slat blind. It lets light through in a certain direction, but not others. Polarizing just means "lining up".

When you make it circular, all you're doing is spinning it, and changing the direction that light can pass through. A fixed plate can still polarize, but just in one direction.

One of the many fun facts you learn in physics. HTH.


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