>
>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:
>----------------------------------------------------------------------
>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.
>----------------------------------------------------------------------
>
Now I underestand. I had seen no photographic difference between linear
and circular polirisers, so I dismissed them.
Chris
When the going gets weird, the weird turn pro
- Hunter S. Thompson
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