Circular vs Linear Polarizer on m4/3 Camera

JDLaing wrote:

Charley123 wrote:

I know (or think I know) that a mirrorless camera can use either type of polarizer. Is that correct?

Is it the linear or circular that is rotated to polarize? I don't recall.

Which would do a better job for image quality on a mirrorless camera?

Could I rotate a polarizer on a lens that has a bayonet mount lens hood?

Linear polarizer is more along the lines for rangefinder where you are not looking thru the lens. Recently, live view has cured that on digital rangefinder bodies.

Circular polarizers rotate to increase or decrease polarization. They are infinitely adjustable.

I would use a circular polarizer on a mirror less body. A good quality one too.

I beg to differ JDLaing:  both linear and circular polarizers rotate to change polarization plane - you must be looking through them to observe the effect (like seeing the blue sky get darker/lighter as you turn the filter).  The difference between them has to do with DSLRs that use a split prism mirror for focusing, they can only use circular polarizers.  A good quality polarizer should have no effect on image quality, but a bad or poorly coated one will - like any cheap filter.  For mirrorless cameras there is no difference lin/circ, having said that, high quality coated linears are getting harder to find.  I am a huge fan of them, still using the ones I had in the Pentax SLR days if the filter size or using a step adapter fits.  My best trick is doing max neutral density range for HDR by crossing two stacked polarizers and taking a picture at each ~10 degrees rotation from lightest to opaque, then merging them: