Mostlenses, excluding just a few models, are supplied with a lens hood as a standard accessory. The lens hood is designed as an integral part of the optics to provide the maximum shading for each lens. For lenses with an Internal Focusing system that cover wideangle ranges, a flower-shaped lens hood is employed. This type of hood delivers the best possible shading effect even when shooting at telephoto because the edge of the hood is extended to the maximum length in the areas corresponding to the top and bottom of the image, while being cut back in the areas that correspond to both sides of the image in order to avoid vignetting at any of the four corners.