1. When with backlight, side light, or flash, it can prevent the entry of non imaging light and avoid fog; 2. During smooth and side light photography, it is possible to avoid surrounding scattered light entering the lens; 3. During lighting photography or nighttime photography, it is possible to avoid surrounding interference light entering the lens; 4. It can prevent accidental damage to the lens, prevent fingers from accidentally touching the of the lens, and to some extent, block the lens from wind, sand, rain, and snow. Colour:black Material:PE style: C for C11 C11HD Package Contents: 1 * Telescope hood Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.