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Thread: Qn:How to blur background.

  1. #1

    Default Qn:How to blur background.

    Qn:
    This was shot at 1/4000, f2.8, 11mm, ISO200.
    Keeping it at 11mm, may I know how could I have added more bokeh and blurred the buildings behind the vehicle? Thks.


  2. #2
    Moderator ortega's Avatar
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    Default Re: Qn:How to blur background.

    photoshop

  3. #3
    Senior Member Kit's Avatar
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    Default Re: Qn:How to blur background.

    Its a wide angle. You won't achieve depth of field that significant to throw the building in the background out of focus.

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    Default Re: Qn:How to blur background.

    Everything to infinity seems clear. You're probably at the hyperfocal (HFF) distance, note that wider the lens the shorter the HFF. To have even a bit of blur on the background you have to move really close to your subject and Manually set the focus at the shortest possible distance.

    refer to http://www.dofmaster.com/charts.html for HFF distance

  5. #5

    Default Re: Qn:How to blur background.

    up to what level?



    not as good as the real thing.

    usually the cheap way is to use maximum zoom at as low a aperture as you can. Usually it means manual focusing.
    Last edited by Reportage; 27th May 2009 at 12:54 AM.
    You wont see me much less remember me but i am the guy who makes you look good.

  6. #6

    Default Re: Qn:How to blur background.

    Why blur it? The picture looks just fine by this way. It give some depth in the picture, and I wanted to try such shot in the street a few months back, but can't find the background like you have there.

    If you really want to make "blur" (bokeh?) background for wide angle, try focus on something nearer, set f to maximum and make sure to take the position as close as possible to the object.

    Something like this:



    Taken using Sigma 10mm FE, f2.8.

    The distant between the flower and the camera, is about 10cm only.
    Last edited by lenrek; 27th May 2009 at 01:10 PM.

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    Default Re: Qn:How to blur background.

    Quote Originally Posted by Reportage View Post
    up to what level?

    Actually the photo look kinda nicer with everything clear

  8. #8

    Default Re: Qn:How to blur background.

    Ahhh, I get it, thks for the tips.

    If I wish to separate the foreground more, what would u suggest..throw a flash perhaps, to get some glint or shine?
    Last edited by redmonsoon; 27th May 2009 at 01:20 AM.

  9. #9

    Default Re: Qn:How to blur background.

    Quote Originally Posted by redmonsoon View Post
    If I wish to separate the foreground more, what would u suggest..throw a flash perhaps, to get some glint or shine?
    you need to find something with min focusing distance, and focus on it. that's about the best you can do. you can make it even shallower with close up lenses, if you so wish, or extension tubes, but that's getting a bit extreme i suppose.

    anyways, with uwa, it is going to be harder to achieve shallow dof, that's about it

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    Default Re: Qn:How to blur background.

    Quote Originally Posted by Reportage View Post
    up to what level?



    not as good as the real thing.

    usually the cheap way is to use maximum zoom at as low a aperture as you can. Usually it means manual focusing.
    Eh, depth of field manipulation result in the blurring of PLANE! not the surrounding area on the photograph itself. Your blur should only be of the background plane.

  11. #11
    Member tammyt's Avatar
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    Default Re: Qn:How to blur background.

    haiz,
    becos of the angle,this is the best that i can do..
    select the area and lens blur it, to make it more real, i usually mask it with the orginal file, and highlight/darken bit by bit...
    of cos it is the best is to use the right lens, photoshop is just a back up...

    The thing that i fear the most, is that my pictures will bore you to death...

  12. #12

    Default Re: Qn:How to blur background.

    Quote Originally Posted by redmonsoon View Post
    Ahhh, I get it, thks for the tips.

    If I wish to separate the foreground more, what would u suggest..throw a flash perhaps, to get some glint or shine?
    For a reflective surface like a car? Your picture may overexpose. From what I leaned, flash is not very usable when it comes to landscape.

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    Default Re: Qn:How to blur background.

    Quote Originally Posted by lenrek View Post
    For a reflective surface like a car? Your picture may overexpose. From what I leaned, flash is not very usable when it comes to landscape.
    Contrary to that, with a reflective surface, flash may actually add more vibrance to your image.

  14. #14

    Default Re: Qn:How to blur background.

    Quote Originally Posted by calebk View Post
    Contrary to that, with a reflective surface, flash may actually add more vibrance to your image.
    Err... He is going to or suppose to set F to the maximum or as big as possible for blurring the background... From my experience, if I set my F to the max on a reflective surface plus flash, very difficult for me to get a properly exposed image.

    Maybe use ND filter?

    Maybe I did not set my flash properly...


  15. #15
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    Default Re: Qn:How to blur background.

    Quote Originally Posted by lenrek View Post
    Err... He is going to or suppose to set F to the maximum or as big as possible for blurring the background... From my experience, if I set my F to the max on a reflective surface plus flash, very difficult for me to get a properly exposed image.

    Maybe use ND filter?

    Maybe I did not set my flash properly...

    Yes, I guess you didn't.

  16. #16

    Default Re: Qn:How to blur background.

    Quote Originally Posted by calebk View Post
    Yes, I guess you didn't.
    Can elaborate more on how to do it?

  17. #17
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    Default Re: Qn:How to blur background.

    Quote Originally Posted by lenrek View Post
    Can elaborate more on how to do it?
    When you set a wider aperture, you have to compensate accordingly with shutter speed. Now that you are adding flash into the mix, you have to underexpose slightly so that the flash can still fill the image without blowing out the exposure.

  18. #18

    Default Re: Qn:How to blur background.

    Use wide angle TS.
    Please Don't Report This Post To A Moderator

  19. #19
    Senior Member giantcanopy's Avatar
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    Default Re: Qn:How to blur background.

    Wider angle lenses have a seemingly greater dof. U can try shooting with faster wide angle lenses like 24mm f1.4 but u will probably not be anywhere near that of shooting at wide apertures with lenses of longer focal lengths.

    T/S can potentially throw any oof areas into a deeper blur , but will need to position the angle of tilt to see what u are intending to focus on.

    Agree that the pic posted looks better without any blur actually

    Ryan

  20. #20

    Default Re: Qn:How to blur background.

    Quote Originally Posted by calebk View Post
    When you set a wider aperture, you have to compensate accordingly with shutter speed. Now that you are adding flash into the mix, you have to underexpose slightly so that the flash can still fill the image without blowing out the exposure.
    OK... This seems fully manual.

    The last time I had such problem was taking a picture of a dragonfly that sit on a leaf in a pond. The area is covered by trees, so is a bit dark. When I on the flash, the water reflect much of the light that it over-expose the picture. I tried adjust EV, ISO, push F to as far as 16 but I did not play with the shutter speed. Maybe next time I can try again.

    Anyway, think we OT too far liao.

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