In article . com,
acl wrote:

On Aug 9, 12:17 am, Joseph Miller wrote:

After exiting the filter,
circularly polarized light will pass though a camera just the same as
unpolarized light, in other words, just fine. The critical thing is that
it won't make any difference at what angle you set that first linear
polaroid.

Just to clarify this a bit, the angle of the polaroid filter makes no
difference as far as the passage through the camera is concerned (ie
it is not the case that, when it is set to some orientation, the AF
system, say, will fail). It does make a difference to the
transmittance, ie it does change the way the scene looks. I imagine
that this is what you meant, but what you wrote is a bit ambiguous.

Yes, you put it more clearly. I meant as far as light going through the
camera itself is concerned, it makes no difference at which angle the
leading polaroid is set.

Joe