Manfrotto Super Pro Tripod Black w Spiked Feet Wide Angle FF High Speed Prime Line FF High Speed Prime Line has been offering the highest resolving power in its class Patented ASP™ microprocessor voltage monitoring Manfrotto uses several different types of anti rotation system: on Magfiber and Digi series tripods the elliptical or three faceted shape of the concentric tubes means they cannot rotate while on round tubed tripods small protrusions down the length of the tube keep sections perfectly aligned The DIGI design uses a single sided pivot between the tripod leg and the shoulder casting to keep the tripods cross section even more compact and to reduce overall weight