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Thread: How to: take potrait with blurred backgnd?

  1. #1

    Default How to: take potrait with blurred backgnd?

    as subject above..

    thx..

  2. #2
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    Set a big aperture for a shallow depth of field(DOF) to achieve a blurred background.

    For example, if you are using a normal 28-80 zoom lens, set the aperture to 2.8-3.3 at 80mm.

  3. #3

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    it's either big aperture.. or large focal length...

  4. #4

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    Use ur largest available aperture and longest zoom.

    urrr.. think this thread was discussed quite a few times? Do a search, can find quite good advices!


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    I will use the largest aperature and take. I've attached a picture. This was taken with a 50mm prime lens at f1.8

    Last edited by coke21; 17th November 2003 at 10:03 AM.

  6. #6

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    Generally, background blur (bokeh) is a function of focal length and aperture. The longer the focal length, the larger the aperture (smaller f number) will give you more bokeh, or a shallow depth of field.

    FOr example,
    - an image shot at f1.4 will give more bokeh then one shot with f8
    - a 85mm lens will give more bokeh then one shot with a 35mm lens

    Some portrait shooters love the 85mm f1.4 lens, some prefer the 105mmf2.8. Some use the 70-200 f2.8. All these lenses have large apertures and long focal lengths. The bokeh with these lenses is outstanding.

    If you are using a digital prosumer camera, I suppose the amount of bokeh you can get is limited. This is because of the very short physical focal length of digital cameras. Even largish apertures from the G series Canons and Olympus cams may at best give adequate bokeh, probably not enough for pure subject isolation. As many post above has suggested, shoot at max telephoto wide open.

    Try also, to focus nearer the foreground, with the subject just at end of the area of focus. I dont know if you get what I mean. Lets say the image is sharp from 2m-10m when you focus at 4m away, place the subject somewhere around the 8m mark.

    And of course, some touch up with PS helps.

  7. #7

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    thx for all the suggestion.. i will go try it..

    but i m using a nikon 5400... can get tat bokeh thingy rite??

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    Quote Originally Posted by netchat
    thx for all the suggestion.. i will go try it..

    but i m using a nikon 5400... can get tat bokeh thingy rite??
    Hmmm you probably need a large aperature. What is the largest for the 5400?

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    but i m using a nikon 5400... can get tat bokeh thingy rite??
    Probably you can get it using PS "Gaussian Blur". Correct spelling?
    Otherwise, the 5400 normally gives a near infinite DOF when not shooting macro.

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  11. #11
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    Quote Originally Posted by wanglk
    Probably you can get it using PS "Gaussian Blur". Correct spelling?
    Otherwise, the 5400 normally gives a near infinite DOF when not shooting macro.
    That is true. You can also use the Gaussian blur tool in PS to create the shallow DOF for the pictures. Then use the history brush tool to unblur the subject. However, you cannot create the nice bokeh effect on PS (correct me if I am wrong)

  12. #12

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    Well... anyone knows if the dof of dimage A1 is good?

  13. #13

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    with a maximum focal length of 50mm and a aperture of f3.5 . You can get adequate bokeh if the focusing distance is close. But with an angle of view of a 200mm, close focusing will result in a very tight composition.
    Last edited by marcwang; 19th November 2003 at 05:19 PM.

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