Enhances the stability For telephoto lens with our tripod mount adapter specifically for models like 70 200mm F4 and 300mm F4L, ensuring secure attachment. From imported aerospace grade aluminum using high precise machining, this durability and wear resistant adapter features a plushie interior lining to protect your lens from scratches. For professional photographers who frequently use telephoto lens for capturing distant subjects precisely. Perfectly for outdoor, sports event, and wildlife observation where long stable photograpgy is essential. Easily switches between horizontal and vertical compositions with the rotating knob, allowing seamlessly conversion without adjusting your tripod head.