The Canon ET-60B Lens Hood for RF-S 55-210mm F5-7.1 IS STM helps to block sunlight or other light sources to prevent glare and lens flare, as well as help protect the lens itself from scratches and the elements. Safeguards against stray light and helps protect lens front element. High quality design and construction. Compatibility: RF-S 55-210mm F5-7.1 IS STM