What cameras need a Circular Polarizer?
Apr 18, 2019 13:06:22 #
scsdesphotography wrote:
Thanks John and John, I did not have a clear understanding as to how a CPL actually rotated the light. So when I'm rotating the front element, it's the linear filter that's moving while the CP behind it remains fixed?
Both elements rotate together.
Apr 18, 2019 13:11:05 #
scsdesphotography wrote:
Thanks John and John, I did not have a clear understanding as to how a CPL actually rotated the light. So when I'm rotating the front element, it's the linear filter that's moving while the CP behind it remains fixed?
Dirt is correct. The relative positioning of the linear and circular (quarter-wave retardation plate) must be maintained, so both rotate.
As I stated, the "front" element is the linear polarizer and it removes the glare in the scene, which is the intended action. That linearly polarized light then goes through the quarter-wave plate and gets turned into circularly polarized light that reflects properly from the mirrors in the camera so as to not "interact badly" with the focus and metering circuitry.
And again, mirrorless cameras don't have the mirrors that are affected by the linearly polarized light, so no need to have the quarter-wave plate. Less material in the optical path should, in theory, result in better photos.
Apr 19, 2019 13:13:44 #
JohnFrim wrote:
Dirt is correct. The relative positioning of the l... (show quote)
Thanks again John and Dirt, that verifies my original observation, they both rotate at the same time, I just didn't realize that CPL's had two layers, unlike polarized sun glasses.
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