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Thread: need some help in DOF( deth of field )

  1. #1

    Default need some help in DOF( deth of field )

    i am using a canon 50mm f1.8 lens . i love the effect when i am taking close up on object or faces with the background blurr . but when i try to take a full body of a person the background seems to be clear too . any setting i can do to make the background blurr ?


    hope some kind hearted pro could give me some help thanks alot

  2. #2
    Senior Member Galdor's Avatar
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    Default Re: need some help in DOF( deth of field )

    What f stop are you using? Where is your focus? Any pictures to show?
    Minolta. Konica Minolta. Sony

  3. #3

    Default Re: need some help in DOF( deth of field )

    Try to shoot open wide (use f/1.8)... if you think the background still not so blurrr, you can either move closer to the object or get 50mm f/1.4.
    Your fastest camera is as fast as your slowest lens

  4. #4

    Default Re: need some help in DOF( deth of field )

    to get blurred background does it mean we need to put the f at 1.8? or at the highest

  5. #5
    Senior Member Galdor's Avatar
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    Default Re: need some help in DOF( deth of field )

    Quote Originally Posted by mygixs View Post
    to get blurred background does it mean we need to put the f at 1.8? or at the highest
    There are a few factors contributing to that effect. Try doing a search on how to get bokeh or shallow depth of field.
    Minolta. Konica Minolta. Sony

  6. #6

    Default Re: need some help in DOF( deth of field )

    haha thanks dude ,i am shooting with F1.8 already . and focusing on the person itself . i know the back ground can be blurr when i move closer but i cant moves any closer becasue i want a full body shoot . so other than geeting a lower F lenes no other setting i can do to get the bluff backgound effect i wanted ?

  7. #7
    Senior Member Galdor's Avatar
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    Default Re: need some help in DOF( deth of field )

    Quote Originally Posted by wayneloh2609 View Post
    haha thanks dude ,i am shooting with F1.8 already . and focusing on the person itself . i know the back ground can be blurr when i move closer but i cant moves any closer becasue i want a full body shoot . so other than geeting a lower F lenes no other setting i can do to get the bluff backgound effect i wanted ?
    How far away is the model from the background?

    I think best to show a picture.
    Minolta. Konica Minolta. Sony

  8. #8
    Senior Member Lomographer's Avatar
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    Default Re: need some help in DOF( deth of field )

    Quote Originally Posted by wayneloh2609 View Post
    haha thanks dude ,i am shooting with F1.8 already . and focusing on the person itself . i know the back ground can be blurr when i move closer but i cant moves any closer becasue i want a full body shoot . so other than geeting a lower F lenes no other setting i can do to get the bluff backgound effect i wanted ?
    do a search on a few methods on how to achieve lowest DOF.

    you can also try using ps to create a faux bokeh effect, or false blur background effect.

    however, this won't be as nice as the "real" deal.
    Pentax K-x

  9. #9
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    Default Re: need some help in DOF( deth of field )

    Quote Originally Posted by sulhan View Post
    try this out, credits to sulhan.
    Pentax K-x

  10. #10

    Default Re: need some help in DOF( deth of field )

    haha i try it with my mum at home . she say her pic too urgly dun allow me to post online . haha yeah the background is kind of near becasue its indoor . does it means if i take the pic in a wide open space with far background the background will have the blurr effect ? yeah i can editthe blurr myself in photoshop but i prefer a natural wants

  11. #11

    Default Re: need some help in DOF( deth of field )

    i saw the artical you posted . it solve my problem .thanks alot Lomographer you are the best .

  12. #12
    Senior Member Galdor's Avatar
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    Default Re: need some help in DOF( deth of field )

    Quote Originally Posted by wayneloh2609 View Post
    haha i try it with my mum at home . she say her pic too urgly dun allow me to post online . haha yeah the background is kind of near becasue its indoor . does it means if i take the pic in a wide open space with far background the background will have the blurr effect ? yeah i can editthe blurr myself in photoshop but i prefer a natural wants
    Yes, with a background away from your subject the bokeh will be achieved easier.
    Minolta. Konica Minolta. Sony

  13. #13
    Senior Member Lomographer's Avatar
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    Default Re: need some help in DOF( deth of field )

    Quote Originally Posted by wayneloh2609 View Post
    i saw the artical you posted . it solve my problem .thanks alot Lomographer you are the best .
    no worries, no i'm not the best

    but thanks, you can try it out with objects as shown by sulhan.

    it's easier and you can post it up here so maybe we can see what the problem is...

    any objects will do... even a small toy
    Pentax K-x

  14. #14

    Default Re: need some help in DOF( deth of field )

    thanks Glador too

  15. #15

    Default Re: need some help in DOF( deth of field )

    If you are shooting 1.6x crop (correct me if i'm wrong), chances are that the background blur will not be strong enough to isolate the entire individual at 50 mm f1.8.

    This is from personal experience.

  16. #16
    Senior Member Lomographer's Avatar
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    Default Re: need some help in DOF( deth of field )

    Quote Originally Posted by surrephoto View Post
    If you are shooting 1.6x crop (correct me if i'm wrong), chances are that the background blur will not be strong enough to isolate the entire individual at 50 mm f1.8.

    This is from personal experience.
    there is a one stop DOF difference on ff as compared to crop (1.5/1.6x) right?
    Pentax K-x

  17. #17
    Senior Member Galdor's Avatar
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    Default Re: need some help in DOF( deth of field )

    Quote Originally Posted by wayneloh2609 View Post
    thanks Glador too
    Most welcome.
    Minolta. Konica Minolta. Sony

  18. #18

    Default Re: need some help in DOF( deth of field )

    Quote Originally Posted by Lomographer View Post
    there is a one stop DOF difference on ff as compared to crop (1.5/1.6x) right?
    Roughly, the exact mathematics are confusing, because to get the same perspective on FF/Crop, the focal length is different and affects the overall intensity and quality of the bokeh and DOF.

    For example;

    50 mm @ f1.8 on FF = 31 mm @ f1.1 on 1.6x crop.

    50 mm @ f1.8 on 1.6x crop = 80 mm @ f2.9 on FF

    This is thus the "Full-frame Advantage".
    Last edited by surrephoto; 8th September 2009 at 04:36 PM.

  19. #19
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    Default Re: need some help in DOF( deth of field )

    Quote Originally Posted by surrephoto View Post
    Roughly, the exact mathematics are confusing, because to get the same perspective on FF/Crop, the focal length is different and affects the overall intensity and quality of the bokeh and DOF.

    For example;

    50 mm @ f1.8 on FF = 31 mm @ f1.1 on 1.6x crop.

    50 mm @ f1.8 on 1.6x crop = 80 mm @ f2.9 on FF

    This is thus the "Full-frame Advantage".
    yea, this is very technical, but thanks for phrasing it in a way easier for me to understand

    Pentax K-x

  20. #20

    Default Re: need some help in DOF( deth of field )

    good man
    Canon EOS 500D|BG-E5|18-55mm f/3.5-5.6 kit| 50mm f/1.8 II | 17-40mm f/4L | 580EXII
    HOLGA GCFN 120

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