The Sigma LH4-01 Lens Hood blocks out extraneous light and reduces flare and ghosting. It easily attaches to the front of the lens with a bayonet mount and also provides additional protection to the lens from accidental impacts, bumps and scratching.
The geometry of the lens hood can vary from a plain cylindrical or conical section (much like a lamp shade) to a more complex shape, sometimes called a petal, tulip, or flower hood. These more complex shapes take into account the final image's shape and aspect ratio. This allows the lens hood to block stray light with the higher portions of the lens hood, while allowing more light into the corners of the image through the lowered portions of the hood, thereby reducing the amount of vignetting in the final image
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