Circular or Linear Polarizer on mirrorless cameras.

<p>So I picked up an EOS M and both EF-M lenses with my tax refund and I started thinking about filter compatibility. My preexisting system is largely FD mount so I never worried about buying circular polarizers, I usually just picked up linears for a song. Now if this was a DSLR I'd want a circular polarizer to prevent exposure error due to the beam splitter between exposure and autofocus favoring polarized light one way or the other depending on angle. Given that this is a mirrorless camera with apparently only one sensor of any type there should be no beam splitting, and no need for a circular filter.</p>

<p>Is this the case: Are circular polarizers just an unneeded extra layer of glass to catch reflections if you don't have an AF SLR? Someone on dpreview suggested there might be an interaction with the antialiasing filter where the filter only worked in the axis of the polarizer. Is that true, and would it even be noticeable/undesirable?</p>

<p>Continue with the linear filter.</p>

<p>Here are two useful links - <a href="http://www.bobatkins.com/photography/technical/polarizers.html">http://www.bobatkins.com/photography/technical/polarizers.html</a>, and,<br>

<a href="http://photo.stackexchange.com/questions/9488/why-does-a-linear-polarizer-work-as-well-as-a-circular-one-on-a-ps-camera">http://photo.stackexchange.com/questions/9488/why-does-a-linear-polarizer-work-as-well-as-a-circular-one-on-a-ps-camera</a></p>

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