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Thread: How to obtain more than 1 focus.

  1. #1

    Default How to obtain more than 1 focus.

    Hi,

    I have done a search on the forum, but no answers were found.

    I took a shot of 2 persons seated about 2-3 metres away from each other (distance from lens are equal though), however, only 1 person's face was in focus.
    Read from dpreview that when the subjects are in the same plane, they'll be in focus. But this doesn't happen to mine.
    I use a D7000 by the way.

    Any help will be appreciated. Thanks !

  2. #2

    Default

    Quote Originally Posted by Amateur108
    Hi,

    I have done a search on the forum, but no answers were found.

    I took a shot of 2 persons seated about 2-3 metres away from each other (distance from lens are equal though), however, only 1 person's face was in focus.
    Read from dpreview that when the subjects are in the same plane, they'll be in focus. But this doesn't happen to mine.
    I use a D7000 by the way.

    Any help will be appreciated. Thanks !
    Show your pic with exif data, it will be easier to guide you.
    Some information to feed you first, how do u determine the subjects are in the same plane?
    How are you positioning your camera towards the 2 subjects?
    What is the distance from the camera to these 2 subjects and what is the focal length and aperture size use.
    These informations will help to answer your doubt. The facts are right, just that is the situation following the assumptions correct.
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  3. #3
    Senior Member bonrya's Avatar
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    Default

    What was your settings used?
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  4. #4

    Default Re: How to obtain more than 1 focus.



    P mode
    focal length 36mm
    f-stop: f/4.2
    shutter speed: 1/8
    exp compensation -0.7

    Both seated on same sofa, so will be on the same plane.

  5. #5

    Default Re: How to obtain more than 1 focus.

    my guess 1 moved his head

  6. #6

    Default Re: How to obtain more than 1 focus.

    i think i know why. the focus point was not on either 1 subject.

  7. #7
    Senior Member edutilos-'s Avatar
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    Default Re: How to obtain more than 1 focus.

    Actually I don't see anything sharp in the picture. I suspect there is camera shake, and the person moved his head as well; for the relatively slow shutter speed used (1/8 seconds), that is to be expected.

    You should bump up the ISO.

  8. #8

    Default Re: How to obtain more than 1 focus.

    1/8s shutter speed? no doubt any movement made by the subjects or your hand/camera would cause them to appear as a blur in the image. if you look carefully, the guy on the left isn't sharp as well. it's called motion blur.

    read up more on shutter speed and how it affects your images.

  9. #9

    Default Re: How to obtain more than 1 focus.

    Quote Originally Posted by edutilos- View Post
    Actually I don't see anything sharp in the picture. I suspect there is camera shake, and the person moved his head as well; for the relatively slow shutter speed used (1/8 seconds), that is to be expected.

    You should bump up the ISO.
    Thanks. Will try again. Was taken at iso 200.
    So assuming all settings are ok, if i were to focus on 1 subject, the one beside him will also be in focus ?
    Thanks

  10. #10
    Senior Member edutilos-'s Avatar
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    Default Re: How to obtain more than 1 focus.

    Quote Originally Posted by Amateur108 View Post
    Thanks. Will try again. Was taken at iso 200.
    So assuming all settings are ok, if i were to focus on 1 subject, the one beside him will also be in focus ?
    Thanks
    It should not be too OOF.

    If you are worried, F/8 will ensure that both are sharp. The D7K is quite ok for higher ISO up to perhaps ISO1600, why are you limiting your ISO so heavily? ISO800 would not be a problem.

  11. #11

    Default Re: How to obtain more than 1 focus.

    Quote Originally Posted by edutilos- View Post
    It should not be too OOF.

    If you are worried, F/8 will ensure that both are sharp. The D7K is quite ok for higher ISO up to perhaps ISO1600, why are you limiting your ISO so heavily? ISO800 would not be a problem.
    Ermm, i try to limit my ISO so as to ensure quality...kiasu i guess. haha

  12. #12
    Senior Member bonrya's Avatar
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    Default

    Quote Originally Posted by Amateur108

    Thanks. Will try again. Was taken at iso 200.
    So assuming all settings are ok, if i were to focus on 1 subject, the one beside him will also be in focus ?
    Thanks
    Why did you choose iso200 for an indoor shot ah? Any reason? Just curious.
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  13. #13

    Default Re: How to obtain more than 1 focus.

    Quote Originally Posted by bonrya View Post
    Why did you choose iso200 for an indoor shot ah? Any reason? Just curious.
    Hi, cos it was very well lit.

  14. #14
    Moderator catchlights's Avatar
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    Default Re: How to obtain more than 1 focus.

    Quote Originally Posted by Amateur108 View Post
    Ermm, i try to limit my ISO so as to ensure quality...kiasu i guess. haha
    what kind of quality can you get if the photos is not sharp in the first place?


    obviously the person moved during the exposure, the 1/8 shutter speed just confirmed this.
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  15. #15
    Moderator catchlights's Avatar
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    Default Re: How to obtain more than 1 focus.

    Quote Originally Posted by Amateur108 View Post
    Hi, cos it was very well lit.
    judging on the skin tone, this photo is underexposed.
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  16. #16
    Senior Member bonrya's Avatar
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    Default

    Quote Originally Posted by Amateur108

    Hi, cos it was very well lit.
    From the picture, plus the 1/8. The room was not well lit at all....
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  17. #17

    Default Re: How to obtain more than 1 focus.

    to you, it might be well-lit. to the camera's metering, however, it might be other-wise.

    your exposure compensation was -0.7. was that done intentionally to increase the shutter speed from lower than 1s?

  18. #18

    Default Re: How to obtain more than 1 focus.

    Quote Originally Posted by Amateur108 View Post
    Ermm, i try to limit my ISO so as to ensure quality...kiasu i guess. haha
    Then you are basically slapping yourself.. see camera nowadays have quite decent ISO management up till at least 1600..Especially on D7000...1600 is no sweat. OK there might be some noise..but would u rather have some noise but sharp pic.. or a totally OOF..blur shot.
    You get the idea? Now you decide.

  19. #19

    Default Re: How to obtain more than 1 focus.

    Quote Originally Posted by Amateur108 View Post
    Hi, cos it was very well lit.
    You have to understand. You are a human. Your camera is no human. They dont see or think as what you see or think...

  20. #20

    Default

    Quote Originally Posted by catchlights
    judging on the skin tone, this photo is underexposed.
    TS mentioned that he shot in P mode with -0.7 exposure compensation.

    I don't know why he did that, but that may explain the under exposed shot.
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