spent a while trying to figure out just what these do. but i bought one and had a mess about at work the other day.
yaris > filter on
yaris > filter adjusted a bit further
bmw > filter on
bmw > filter adjusted a bit further
cafe door (look at the window on the right) > filter on
cafe > filter adjusted a bit further
so there you go.. they do things like that.
more info on them here: http://dpfwiw.com/filters.htm#polarizers
yaris > filter on
yaris > filter adjusted a bit further
bmw > filter on
bmw > filter adjusted a bit further
cafe door (look at the window on the right) > filter on
cafe > filter adjusted a bit further
so there you go.. they do things like that.
more info on them here: http://dpfwiw.com/filters.htm#polarizers