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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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You can download a pattern to make your own hood from this site. Please note that the hood will only be the proper size if it is printed without scaling on the designated paper size. Even if you deci …
answered Jul 7 '16 by Michael C
7
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Update (10/2017): Since the answer below was written I have used a 3rd party hood bought through amazon that, although made of black plastic, had a shiny, reflective finish. If there were strong light …
answered Apr 27 '13 by Michael C
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I've never seen a conventional hood that will allow use of step-up rings. About the closest you might come to that for most lenses would be a filter system with a holder, such as the Cokin P-series sy …
answered Sep 1 '16 by Michael C
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If you are on a really tight budget, you can download and print a pattern to make a hood for your lens out of stiff paper or cardboard. This site has patterns for many popular lenses.
answered Dec 10 '14 by Michael C
3
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Why are most things the price they are? Two primary factors: The cost of production. The more complex shape requires more production expense. The tulip also requires more materials for any given len …
answered May 18 '13 by Michael C
4
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I use lens hoods almost religiously. My 70-200mm never comes out of the bag without it. Ditto for any of my other zooms or primes above 24mm. Indoors in totally controlled studio lighting I sometimes …
answered Mar 29 '17 by Michael C
9
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There are a few zoom lenses that effectively do what you envision, but it is not due to movements of the hood. Rather, it is due to a retrofocus design that extends the lens barrel fully at the widest …
answered Jan 12 by Michael C
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If you are on a really tight budget you can download a pattern and print it to make a hood for your lens out of stiff paper or thin cardboard. Just be sure not to resize anything when printing. Here' …
answered Sep 10 '15 by Michael C
31
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Your camera is almost certainly applying lens correction for geometric distortion to the JPEG images. This results in the edges of the widest angle images being cropped slightly to correct the barrel …
answered Jan 10 '18 by Michael C
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For the vast majority of Canon lens hoods, if the number part of the name of the hood is the same as the number part of the name of another hood then the hood will mount on lenses for which the other …
answered Jun 24 by Michael C
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The ET-87 hood that came with my EF 70-200mm f/2.8L IS II lens in 2010 measures 4 3/8 inches (112 mm) at the widest point.
answered Jul 24 by Michael C
4
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Most lenses from the major manufacturers have a proprietary connector that the hood uses to attach to the front of the lens. While you can purchase hoods that attach to filter threads, that doesn't gu …
answered Jul 9 '15 by Michael C
3
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For a 55-300mm lens in general whether you use a circular or petal shaped hood won't make that much of a difference in terms of performance. That is why few lenses in the telephoto focal length range …
answered Oct 18 '15 by Michael C
11
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The ES-52 works a little differently than most lens hoods we are accustomed to seeing. Instead of blocking off-axis light by extending a cylinder or cone perpendicular to the image plane and centered …
answered Jan 17 '14 by Michael C