Best Seller | Nikon RT-1 Tripod Mount Ring For 70-200mm f/4G Lens 4981 Authorized Nikon USA Dealer! Read 29.00 User Reviews on the RT-1 Tripod. Buy today from B&... The RT-1 Tripod Mount Ring For 70-200mm f/4G Lens from Nikon is designed for the 70-200mm f/4G lens. The ring makes rotating your lens easier and the built-in tripod collar improves lens balance by screwing into the tripod mount. more | | $154.95 FREE shipping go to store |