The Kowa LMZ110M3R 1/3" 3-Motor Zoom Lens (6 to 90mm) incorporates the 3-Cam design that solves the problem of de-centering which sometimes occurs in the conventional pole system. Not only is the movement of the lens impaired by de-centering, but the optical performance suffers too. The 3-Cam Design also reduces internal reflection so that the image obtained is sharper than that of the conventional pole system. With the 3-Cam design, the customer can expect higher optical performance and a longer service life.