The inner wall of the hood is matte to deal with the reflection. Application: for Canon EF 100-400mm f/4.5-5.6L IS II USM Lens
In backlight, side‑light, or flash photography, it prevents the entry of non‑image light and prevents haze.
In frontlighting and side‑light photography, scattered light around the lens can be avoided.
When light or night photography, it prevents ambient interference light from entering the lens.
It can prevent accidental damage to the lens, and can prevent fingers from accidentally touching the lens surface, but also to a certain extent to cover the lens from wind, sand, rain and snow.