 Circular polarizers
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Physikfan
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Sat Apr 07 2018, 09:50PM
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Registered Member #60240
Joined: Mon May 16 2016, 07:01PM
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Posts: 304
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It is well known to use polarizers when one wants to photograph water surfaces to get underwater pictures.
At a certain angle (Brewster angle), the reflected light is completely linearly polarized, with a linear polarizer one can therefore attenuate this reflected light almost to zero intensity.
For DLSRs, however, one should use circular polarizers, which consist of a linear polarizer filter and a lambda quarter plate lying behind it for generating circularly polarized light, so that linear polarization-sensitive elements of the DLSRs (beam splitters, etc.) are not irritated.
But if you are unlucky, you use a circular polarizer which has the filter foil installed the wrong way:
An example of this is shown in the following picture of a light trap consisting of a reflective metal surface with a circular polarizer attached to it:
As you can easily see, the screw thread is on the wrong side.
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