The recent discussion on circular polarizers caused me to ask myself
whether I really need an (expensive) circular polarizer on a mirrorless
camera. With our now unimpeded sensors might we be able to go back to
the linear polarizers we used prior to beam-splitting autofocus or
beam-splitting metering systems? So I looked up what Wiki has to say on
circular polarizers and found this:
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There are two types of polarizing filters readily available, linear and
"circular", which have exactly the same effect photographically. But the
metering and auto-focus sensors in certain cameras, including virtually
all auto-focus SLRs, will not work properly with linear polarizers
because the beam splitters used to split off the light for focusing and
metering are polarization-dependent. Linearly-polarized light may also
defeat the action of the Anti-aliasing filter (Low-pass filter) on the
imaging sensor.
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I found what I expected which told me I should be able to use a linear
polarizer on my E-M5... except for the bit about *maybe* defeating the
anti-aliasing filter. That was a surprise... but does it, and
furthermore, is that a bad thing?
I'm 1300 miles away from my linear polarizer. Anybody ever tried it?
Chuck Norcutt
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