the stereo enthusiast and clever inventor, Seton Rochwite developed - and manufactured
in his own workshop - a limited number of polarizing units. It would be nearly
impossible to improve on his design. Not only are the two lens filters linked,
but so too is the filter on the viewfinder lens. One could see the effect the
filter would have through the viewfinder. The unit replaces the original bakelite
lenscap assembly and is hinged so that the polarizers may be swung up out of
the way when not required.