Manfrotto Super Pro Tripod Black w Spiked Feet Wide Angle Li ion battery BP 21 Li ion battery BP 21 FF High Speed Prime Line has been offering the highest resolving power in its class 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 Retractable spiked feet mean you can use this both outdoors (with the spike extended for better grip on soft terrain moss plants etc) and indoors on delicate floor surfaces (with the rubber foot covering the spike to avoid damage and give more stable non slip support)