Reduce the amount of stray light that enters the front element of your EF 24-105mm f/3.5-5.6 IS STM and EF 24-105mm f/4L IS II USM Lens with the Canon lens Hood EW-83M. By shading the front of the optic and blocking excess light, it prevents flare. Additionally, because it protrudes past the end of the lens, the hood offers some added protection.