The included 161mm diameter Brilliant-Pol Circular Polarizer has a broadband multi-layer anti-reflection coating and has 38% transmission for a 1.5 stop light loss. The large 6.25" clear aperture is useful even with wide angle lenses and large zoom lenses. It is noticeably more useful than other rotapola filters that use 6" diameter polarizers (with 5.8 inch clear apertures).
Rotation of the polarizer can be done by spinning either of the two geared thumb wheels by hand or with a motor mounted on either of the two 20 threads in the handle. The thumb wheel gears are engraved with letters A through H and one rotation of the thumb wheel gear gives a 90-degree rotation of the polarizer.
