In article ,
"Matt Clara" wrote:

The reason for this is that both of these systems use semi-silvered mirrors
to siphon off some of the light coming though the lens. If that light is
linearly polarized it renders either the metering or the autofocus
ineffective. This means that you're going to have to buy circular polarizers
unless you're shooting with a pre-1970's camera, or a view camera."

There is another reason that might effect some systems. And that is any
camera that has a polarized system in the viewfinder for display
readouts. If the camera has that type of display then as a linear
polarizer is rotated some display information may disappear and reappear
or be harder to read at some points of rotation then at others.

--
To reply no_ HPMarketing Corp.