Aperture Trouble

Discussion in 'Photography Beginners' Forum' started by allsdown, Sep 15, 2009.

  1. allsdown

    allsdown TPF Noob!

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    I'm having difficulty adjusting my Depth of Field on a Nikon D70. When I play with the aperture the picture only gets really dark or really bright, the background doesn't change focus. Is there another setting on my camera I should adjust or what is going on?

    Thank you!
     
  2. Goontz

    Goontz TPF Noob!

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    Are you also adjusting the shutter speed to compensate for the change in aperture? What's the light meter indicate?

    Got any examples, preferably with exif data?
     
  3. allsdown

    allsdown TPF Noob!

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    I was only using the Aperture mode when doing this and that doesnt allow me to also adjust shutter speed. Should I go into Manual mode where I can adjust both? I'm really new to this camera
     
  4. Overread

    Overread has a hat around here somewhere Staff Member Supporting Member

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    Distance is also a key component of depth of field - if you have a focused subject close to the camera -and then a far off background, even if you use a small aperture (big f number) like f16 then the background elements will still be out of focus since they are (reletivly speaking) so far away when compared to the foused subject.

    That would be my guess of what you are experiencing - but as Goontz suggested if we could have a look at the shots you were trying to take and the exif (aperture, shutter speed, ISO) that you were using we might be able to better understand and advise.
     
  5. allsdown

    allsdown TPF Noob!

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    The shutter is on auto and the ISO is also on auto and set at 400

    This is what I'm trying to get a picture of, this is taken in auto mode:
    [​IMG]


    This is F 11 taken in aperture mode:
    [​IMG]


    This is F 3.5 taken in aperture mode:
    [​IMG]
     
  6. Goontz

    Goontz TPF Noob!

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    Your exposure bias got bumped down to -5. That's what causing the underexposure. Put it back to 0 and you should be good to go.
     
  7. Overread

    Overread has a hat around here somewhere Staff Member Supporting Member

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    Yep you have exposure comensation enabled - read up in your manual about using that feature and how to control it. Essentailly your camera is being told to meter the scene and then underexpose it by 5 stops of light - which is why your getting such a dark shot. There are times when you will need and use this feature - for when your shooting something that the meter can't get quite right (either over or under exposing) or when you want a select effect.

    You might also find the following book - Understanding Exposure by Bryan Peterson - a very helpfull read and introduction into controling aperture, ISO and shutter speed as well as using them for "correct exposures" as well as starting to understand just what a correct exposure is
     
  8. Lyncca

    Lyncca TPF Noob!

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    When I looked at the EXIF data it said, "Exposure Bias Value: -5EV"

    This means the exposure is dialed in as 5 stops under, then it would indeed be dark at either aperture.
     
  9. Lyncca

    Lyncca TPF Noob!

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    LOL, all 3 of us posted at the same time. At least I can figure out what is wrong now! This stuff used to drive me nuts.
     
  10. Goontz

    Goontz TPF Noob!

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    +1. An excellent book and very helpful.
     
  11. allsdown

    allsdown TPF Noob!

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    Thank you so much guys!! It was so frustrating not knowing what was wrong! Thanks a bunch!
     
  12. Goontz

    Goontz TPF Noob!

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    No problem, good luck!
     

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