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Thread: how do i achieve behind blur and infront forcus??? without ps

  1. #21
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    Default Re: how do i achieve behind blur and infront forcus??? without ps

    Thx for e add-ons...

    But now I think zoossh is askin wat 'Bokeh' is; n not wat contributes to it...
    Last edited by hazta; 3rd October 2006 at 10:46 AM.

  2. #22
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    Default Re: how do i achieve behind blur and infront forcus??? without ps

    Quote Originally Posted by ortega View Post
    actually there are a number of factors to consider

    1. Focal lenght of lens (the longer the focal lenght the less DOF you get)
    2. Aperture (the bigger the aperture (smaller f-stop) the less DOF you get)
    3. Subject to camera distance (the higher the magnification the less DOF)
    4. Subject to bg distance (the further the blurrer)
    5. lens used (some lenses have better bokeh than others)

    so for max. effect use all of the above
    one more, the focus distance cannot reach infinity, if not, it will achieve all clear

  3. #23

    Default Re: how do i achieve behind blur and infront forcus??? without ps

    Quote Originally Posted by clarinet View Post
    one more, the focus distance cannot reach infinity, if not, it will achieve all clear
    It is not just infinity. There is a point call hyperfocus distance. Beyond this distance, all of the background will appear in focus.

  4. #24

    Default Re: how do i achieve behind blur and infront forcus??? without ps

    Thread starter did not say if he was using a P&S camera or a DSLR. Even with aperture wide open, it is hard to get a shallow dof with a P&S, purely because the sensor is so small. On my Canon S45 I could only get shallow dof with maximum zoom, max aperture and focusing as close as possible.

  5. #25
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    Default Re: how do i achieve behind blur and infront forcus??? without ps

    Quote Originally Posted by clarinet View Post
    one more, the focus distance cannot reach infinity, if not, it will achieve all clear
    infinity focus with big aperture - foreground will be blur

  6. #26
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    Default Re: how do i achieve behind blur and infront forcus??? without ps

    Quote Originally Posted by Scaglietti View Post
    It is not just infinity. There is a point call hyperfocus distance. Beyond this distance, all of the background will appear in focus.
    it also depends on aperture used

  7. #27

    Default Re: how do i achieve behind blur and infront forcus??? without ps

    see here for bokeh comparison test.. between a 1.2 nd 1.8 lens

    http://www.wlcastleman.com/equip/rev...background.htm

  8. #28

    Default Re: how do i achieve behind blur and infront forcus??? without ps

    Newbie here.... reading through n getting really holan
    I'm very confused now....

    In the previous posts:
    "2. Aperture (the bigger the aperture (smaller f-stop) the less DOF you get)"

    But in the website provided:
    http://www.wlcastleman.com/equip/rev...background.htm

    The blurring is clearing at the smaller F-stop, where the backgnd is blur w/ a focus subject.

    So does more DOF (depth of field) means blur bkgnd or clear bkgnd?

    Thank you

  9. #29
    Senior Member zoossh's Avatar
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    Default Re: how do i achieve behind blur and infront forcus??? without ps

    Quote Originally Posted by ZeRoCoOl View Post
    Newbie here.... reading through n getting really holan
    I'm very confused now....

    In the previous posts:
    "2. Aperture (the bigger the aperture (smaller f-stop) the less DOF you get)"

    But in the website provided:
    http://www.wlcastleman.com/equip/rev...background.htm

    The blurring is clearing at the smaller F-stop, where the backgnd is blur w/ a focus subject.

    So does more DOF (depth of field) means blur bkgnd or clear bkgnd?

    Thank you
    more depth of field means more distance in front and behind of the focal plane remains relatively sharp, in your term the answer is "more DOF (depth of field) means clear bkgnd"

    by the way, can you all refrain from posting in some less commonly used abbreviations, such as e and w/ a? it makes reading and understanding difficult. thanks.

  10. #30

    Default Re: how do i achieve behind blur and infront forcus??? without ps

    Quote Originally Posted by ZeRoCoOl View Post
    Newbie here.... reading through n getting really holan
    I'm very confused now....

    In the previous posts:
    "2. Aperture (the bigger the aperture (smaller f-stop) the less DOF you get)"

    But in the website provided:
    http://www.wlcastleman.com/equip/rev...background.htm

    The blurring is clearing at the smaller F-stop, where the backgnd is blur w/ a focus subject.

    So does more DOF (depth of field) means blur bkgnd or clear bkgnd?

    Thank you
    Seem like you are really still blur...

    More DOF does not mean you will get blur or clear background...DOF is actually refering to the the distance of between the focus object and the background....shallow DOF means the distance is short, in layman term, its means the forcus object is very near to the background....

    TO all experience bros and sis, please correct me if i am wrong, I am still a newbie....

  11. #31
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    Default Re: how do i achieve behind blur and infront forcus??? without ps

    Quote Originally Posted by eng_keow View Post
    Wow. So complete. Thanks for sharing.

    In other words:

    Use tele lenses. For those using macro lenses - like 100mm macro. Even closing the aperature down to f8 can't get the whole dragonfly in focus. I was taught to use f16. Therefore in your case, open the aperture, f2.8 if possible. However, some lenses do not give a sharp image if the aperture is opened wide. So you have to find out about the lens as ortega has mentioned.

    Oh, btw, the blurring in the bg is called bokeh. Ppl always like a creamy bokeh. If there are lights in the bg, they will appear as round or octagonal bright spots on the screen. The number of sides that these round lights have depend on the number of blades you have in the lens.
    Good morning.

    Sorry for interrupting. Was passing through this thread. And set me wondering. Is that supposed to be 'dreamy bokeh' or 'creamy bokeh'?

  12. #32
    Moderator ortega's Avatar
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    Default Re: how do i achieve behind blur and infront forcus??? without ps

    Quote Originally Posted by Phat Phreak View Post
    Good morning.

    Sorry for interrupting. Was passing through this thread. And set me wondering. Is that supposed to be 'dreamy bokeh' or 'creamy bokeh'?
    creamy bokeh

  13. #33

    Default Re: how do i achieve behind blur and infront forcus??? without ps

    Quote Originally Posted by ortega View Post
    creamy bokeh
    but.. creamy bokey = dreamy bokey imo

  14. #34
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    Default Re: how do i achieve behind blur and infront forcus??? without ps

    Quote Originally Posted by jdredd View Post
    but.. creamy bokey = dreamy bokey imo
    it would depend on what kind of dreams you have ...

  15. #35
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    Default Re: how do i achieve behind blur and infront forcus??? without ps

    Infinity focus will cause obj from a certain distant infront of the lens to infinity to be in-focus, not all obj leh. So obj say 3m away may not be in-focus with infinity or even hyperfocal focus distant....this must be calculated with parameters like aperture setting, lens focal length and lens focus distant.

    Quote Originally Posted by clarinet View Post
    one more, the focus distance cannot reach infinity, if not, it will achieve all clear

  16. #36
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    Default Re: how do i achieve behind blur and infront forcus??? without ps

    Quote Originally Posted by ortega View Post
    it would depend on what kind of dreams you have ...

    Yup.... everything looks creamy when you are dreamy

  17. #37
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    Default Re: how do i achieve behind blur and infront forcus??? without ps

    Quote Originally Posted by Phat Phreak View Post
    Yup.... everything looks creamy when you are dreamy
    some dreams are wet
    some dreams are dark and scary

  18. #38

    Default Re: how do i achieve behind blur and infront forcus??? without ps

    Quote Originally Posted by ortega View Post
    some dreams are wet
    some dreams are dark and scary
    heh.. u guys ah.. dreamy -
    resembling a dream; ethereal or vague.
    Soothing and serene.
    Inspiring delight; wonderful.

    hence.. good bokeh = dreamy bokeh.

  19. #39
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    Default Re: how do i achieve behind blur and infront forcus??? without ps

    Quote Originally Posted by jdredd View Post
    heh.. u guys ah.. dreamy -
    resembling a dream; ethereal or vague.
    Soothing and serene.
    Inspiring delight; wonderful.

    hence.. good bokeh = dreamy bokeh.
    Wah! , So 'chim'

    Me lost already

    Me English half past six only....

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