Precise engineered with lightweight yet robust aluminum construction, this replacement mount collar ensures optimal weight distribution and compatibility with standard tripods Ideal for professional photographers and wildlife enthusiasts seeking reliabled for large telephoto lens during dynamic outdoor or studio Perfectly suited for capturing fast moving subjects in sports, aviation, or nature photography where lens stability directly impacts image sharpness Enhances stability and balance for EF 100 400mm II lens with this durability aluminum alloy tripod mount collar, designed to securely heavy telephoto setups during extended shoots The RJ102 tripod collar replacement features a tool less installation design, maintaining seamless integration for EF 100 400mm II while reducing front heavy lens sag