Hood has a variety of sizes, should be used with the lens focal length to match the kind. The shorter the focal length of the lens, the greater the angle, the hood is shorter. If the standard lens hood cap on the use of wide-angle lens, is bound to have consequences around the screen can not be imaged. On the contrary, you can not play its due role in the hood. When using a zoom lens, preferably equipped with freely retractable hood Hood is widely used in backlighting photography 4 can prevent accidental damage to the lens, also avoid finger inadvertently lens surface, but also to some extent for the lens block the wind, rain and snow.3 In light photography or night photography, to avoid the interference of light entering the lens.2 in the light and side light photography along, avoid scattering light into the lens.1 In the backlight, side light or flash photography, it can prevent non-image-forming light to avoid the mist. Its role are the following: Hood is widely used in backlighting photography, generally avoid glare. However, if the light source from the past, there may occur glare. At this point, you can hand side where the light shielding hood. Glare is eliminated from the viewfinder clearly observed.4 can prevent accidental damage to the lens, also avoid finger inadvertently lens surface, but also to some extent for the lens block the wind, rain and snow.3 In light photography or night photography, to avoid the interference of light entering the lens.2 in the light and side light photography along, avoid scattering light into the lens.1 In the back light, side light or flash photography, it can prevent non-image-forming light to avoid the mist.Hood is set in front of the camera lens used in photographic accessories. It has the Product Material] ABS made with environmentally friendly, bayonet design