Manfrotto Super Pro Tripod Black w Spiked Feet DSLR GC5101 is the choice when GC5101 is the choice when the Systematic tripod + head combination is longer than GC4101 or when the head is too large for GC4101 and placing the included mounting tabs over the screw holes 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) 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