What Does a Lens Hood Do?

A 300mm DSLR lens placed on a stump with a round lens hood attached.

What could be more exciting than a 300mm lens with a lens hood sitting on a stump?

Everytime I see one of my photography students with the lens hood on backwards, I know they don’t know what the lens hood does.  The lens hood is designed to reduce flare and protect the lens, among other things.

What is the purpose of a lens hood?

The lens hood is a piece of plastic that clips onto the front of a camera lens and extends beyond it.  Lens hoods serve two primary purposes: (1) reducing lens flare, and (2) protecting the lens from damage.  The intended purpose of the lens hood is simply to reduce lens flare, but the protection it provides to the glass elements of the lens is a beneficial side-effect.

Why are many lens hoods shaped so funny?

What you’re probably referring to is the shape of what is called a “petal lens hood.”  The shape of a petal lens hood allows it to extend as far as possible beyond the lens without showing up in the frame.  Lenses are circular, but the pictures we take are rectangular.  If these petal lens hoods were perfectly round, the corners of the hood would be in the picture.  The only thing worse than getting a lens hood in the picture is when you hand your point and shoot to Uncle Harry, who puts his finger right over the lens when he takes a picture… ugh!

But not all lens hoods are petal lens hoods.  Some lens hoods are completely enclosed without the weird cut-out shape.  This type of lens hood is called a “round lens hood.”  Prime lenses have round lens hoods more often than zooms, because they don’t have the added difficulty of keeping out of the way as the camera zooms out.

Should I use a lens hood on my camera?

The short answer is yes.  I almost always have a lens hood on my camera.  While shooting without a lens hood can still produce great pictures most of the time, if any light happens to bounce into the lens from the sides, the contrast and color in the image is significantly reduced.  Also, it is nice to have a lens hood for protection of the lens.

However, there are some lenses on which a lens hood is simply unnecessary.  I recently saw one of my photography students with a lens hood on his 50mm f/1.8 prime lens.  It looked quite strange because most people don’t use a hood on that lens.  The reason is that the plastic on the lens already extends behind the glass of the lens, so the glass is recessed.  Therefore, the lens itself acts as a lens hood.  There is nothing wrong with using a lens hood on such a lens, but it is hardly necessary in most situations.

Do lenses come with a lens hood, or do I need to buy one?

Some lenses come with the hood, and others do not.  Canon generally provides a lens hood for the L series (professional) lenses, but not for the consumer level lenses.  For those lenses, you’ll need to head on over to Amazon.com and buy one for around $20.

If you are either really cheap or just love doing things yourself, you can actually make a lens hood by going to this website and following the directions.

Comments from the I.P. Community

  1. Duh says

    If hoods really did jack squat, there would be many many many pictures on the web both showing, with and without said lens hood to show how it supposedly effects contrast and colors. Never seen them, ergo, its a urban myth and therefore the ol’ hand is used instead.

  2. Mike says

    As a beginner photographer (Nikon D80 with 70 – 210mm lens), I am glad to learn about lens hoods, in particular to know what a petal hood is all about. I have an off-topic question however, and that is to learn how those (mostly) sports phtographers can use such large lenses at short range? Seems they all have this massive lens sticking right in the face of the athlete, close enough to highlight his/her blackheads. How do they do that, and why?……..If this is explained in some other article, then please point me to it. Thanks.

  3. Craig says

    WOW i`m quite new too this, But thankyou so much for explaining the lens hood!
    I`ve been wondering what it does…and after seening that example on imagesshack it really does show.

    I use a a290 55mm lens and i`m still learning to this day!
    I am getting there but very slowly.
    I want say thats a great example of what a lens hood can do & thanks for sharing your knowledge.

    Craig

  4. says

    I’d be wary of assuming people with the lens hood on backwards don’t know what they’re doing. Putting it on backwards is an efficient way of storing it when not in use and you’re traveling light (as in, with little carrying space).

    • says

      @David – Key word there is when NOT in use. I’m talking about people using the lens with the hood on backwards. Many photographers get the lens and have no idea that it is to be turned around. I see it often in photowalks and the photographer is always amazed when I turn it around for them.

  5. Patti Mc. :-) says

    Can I use a Rubber lens hood on my Canon EOS 450 D? I have a Canon lens that goes from 55 to 250. It is a telephoto/zoom lens and I would like to use it for taking pictures at the zoo. Is this a wise thing to do? I want to take pictures of reptiles and amphibians against the glass is this possible with this rubber lens cover and does it reduce the glare
    Thanks for your help,

    Patti. Mc. :-)

  6. renderbender says

    Hi Patti MC, dunno if your question has been answered apart from this thread, but I think a circular polarizer is what you need. I’m also new to this but I happened upon such talk about the need for a CPL when taking shots through glass.

  7. Richard Joe-Leonn says

    I’m also starting in photography I got asked to take a bunch of pictures of a retreat we do every year and the response was WOW nice pics.I’m an artist so I tend to see outside the box.This make for interesting pictures.

    I really don’t know what I’m doing but some how it works out I try not to use auto very much manual setting is a science

    I also tend to take pictures of structured perspective. Objects round and curved things I don’t even know what to call that kind of shooting anyway thanks for being here I to didn’t know what a hood was for now I know I have lot’s lot’s questions.

  8. says

    I’m finding an issue with my lens hood and I think I know the answer, but would like confirmation from someone on this.

    I have an 18-135mm zoom and when I shoot with the lens hood on i’m finding that the images sometimes get cut off in the corners and while i’m assuming its because of the hood. Is the real reason because I shouldn’t be shooting with the lens hood on while at the widest point ie: 18mm???

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