TABLE I Combinations of Tilt Angle and Second Polarizer Angle for Compensated Azimuthal Polarization Rotation Tilt angle, ??1 Second polarizer angle, ??2 0??? 0??? 30??? 42??? 45??? 56??? The optically transparent element 722 need not be a second MacNeille polarizer, however, and other elements may be used, for example, one or more quartz plates or a wire grid polarizer.