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A lens hood is a device which sticks onto a lens, which helps shield the lens from stray light. They often have a flower-shaped design, which gives maximum protection while minimizing the vignetting on the image.

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The front of the AF Zoom-Nikkor 35-70mm f/2.8D (both the hood bayonet and filter thread) rotates during focus. Therefore a petal type lens hood would not be correctly aligned most of the time. Hence t …
answered Jul 26 '17 by HLT