What causes those "bulls eyes" on "bokeh"?

Discussion in 'Photography Beginners' Forum' started by Abby Rose, Sep 7, 2010.

  1. Abby Rose

    Abby Rose TPF Noob!

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    On those little out of focus circles, what causes the bulls eye appearance that you get sometimes? How can you avoid it?
     
  2. kundalini

    kundalini Been spending a lot of time on here!

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    Can you explain what you mean by 'bulls eyes'? Or better yet, give an example.
     
  3. Taylor510ce

    Taylor510ce TPF Noob!

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    I think you are referring to lights in the background..... try putting some christmas lights up as a background and see what it does just as an extreme example.
     
  4. Big Mike

    Big Mike I am Big, I am Mike Staff Member Supporting Member

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    The ones that you usually see, come from specular highlights (small bright areas). The shape of them reflect the shape of the aperture in your lens. Higher quality lenses often have more aperture blades, thus a rounder aperture opening, and some say...a more pleasing bokeh.

    You can also shape the 'bulls eyes' by cutting out a shape in a card/paper and holding it in front of the lens.

    [​IMG]
    from HERE
     
  5. Taylor510ce

    Taylor510ce TPF Noob!

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    I never knew that. So you just cut out a large shape and then make sure your subject is inside and then crop the edges?
     
  6. benlonghair

    benlonghair TPF Noob!

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    Do you mean crappy bokeh like this?

    [​IMG]

    I've been told that this is caused by VR working.
     
  7. benlonghair

    benlonghair TPF Noob!

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    I was under the impression that took using a shaped aperture in a lensbaby or something. But Mike knows a lot more than me.
     
  8. Big Mike

    Big Mike I am Big, I am Mike Staff Member Supporting Member

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  9. epp_b

    epp_b No longer a newbie, moving up!

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    Bulls-eye or doughnut bokeh is characteristic of mirror lenses.
     
  10. reznap

    reznap No longer a newbie, moving up!

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    ^ This..
     
  11. Derrel

    Derrel Mr. Rain Cloud

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    Do you mean "onion" bokeh perhaps???

    Bokeh
     
  12. Tee

    Tee Been spending a lot of time on here!

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    Thanks for that link, Mike. I am so going to try that tomorrow when I get home from work.
     

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