Fits to the front of the EF-S 35mm Macro IS STM, reducing flare caused by light shining directly on to the front of the lens. It helps prevent stray light from entering the lens to keep unwanted glare from affecting your photographs. When used with the EF-S 35mm Macro IS STM, it prevents reflections of the Macro Lite on the front of the lens from reflective surfaces. Its threaded front allows for mounting of 49mm filters such as the Canon 49mm Protect Filter Benefits Minimise lens flare affecting your photo Prevents the reflection of the Macro Lite at the front of the lens Compatibility EF-S 35mm f/2.8 Macro IS STM