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FOTOKINA This is a black, petal-shaped (also known as "flower" or "tulip" shaped) lens hood, clearly labeled "EW-73B" on its front surface. Lens hoods like this are essential camera accessories designed to block stray light from entering the lens, thereby preventing lens flare and ghosting that can degrade image quality.The petal shape is particularly effective for wide-angle and zoom lenses as it allows the hood to block light efficiently without vignetting (darkening of the corners of the image), even at wider focal lengths. The "EW-73B" designation indicates it's a specific model, likely designed for certain Canon lenses, as "EW" is a common prefix for Canon lens hoods. It would typically attach to the front of a compatible camera lens, usually via a bayonet mount.