How do I increase d.o.f.

Discussion in 'Beyond the Basics' started by AaronJAnderson, Jul 8, 2009.

  1. AaronJAnderson

    AaronJAnderson TPF Noob!

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    Trying to learn how to adjust things manually to get more desirable results. After all, that's why I bought a DSLR.

    I'm shooting with the kit lens (18-55)
    Take this photo for example, shot at 55mm in AUTO mode.

    I would like more of the image to be in focus. What do I need to do? Adjust ISO and F stop?

    [​IMG]
     
  2. PhotoXopher

    PhotoXopher TPF Noob!

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    Get out of Auto mode and switch to manual or Aperture priority and open the lens up.
     
  3. HeY iTs ScOTtY

    HeY iTs ScOTtY TPF Noob!

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    use a large aperture
     
  4. Big Mike

    Big Mike I am Big, I am Mike Staff Member Supporting Member

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    Yes, switch to Aperture Priority mode but you want to 'stop down' the lens...not open it up.

    The DOF is controlled main by the lens aperture. The larger the aperture, the more shallow the DOF...so the smaller the aperture, the deeper the DOF. Now keep in mind that a smaller F number is a larger aperture and thus a higher F number is a smaller aperture.

    So in Aperture mode, you could choose something like F11 or F16 etc. That should give you a lot more DOF. However, when the aperture gets smaller, the shutter needs to stay open longer...and if the shutter speed is too long (slow), then you will get blurry photos unless the camera and subject are perfectly still (use a tripod).

    DOF is also controlled by the focal length. A shorter focal length (zoom) will give you a deeper DOF. The distance from the camera to the subject also has an affect on DOF...the farther away you are, the deeper it gets.
     
  5. AaronJAnderson

    AaronJAnderson TPF Noob!

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    That's a big F number, which is a small opening in the lens, correct?
     
  6. Big Mike

    Big Mike I am Big, I am Mike Staff Member Supporting Member

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    He want's more DOF...so he needs a smaller aperture (high F number)
     
  7. farmerj

    farmerj TPF Noob!

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    "Open the lens" would be using a Larger aperture. This is actually a "smaller" number, like f/3.5 or therebouts.


    To get MORE DOF, you would use a smaller aperture or larger number like f/22 or greater.


    http://www.dofmaster.com/dofjs.html
     
  8. AaronJAnderson

    AaronJAnderson TPF Noob!

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    That makes sense. I'll give it a shot when I get home.

    Should the ISO be adjusted along with that or will I get satisfactory results just changing the f stop?
     
  9. Moglex

    Moglex TPF Noob!

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    If you switch to aperture priority mode the camera will change the shutter speed to allow for the smaller aperture.

    This means that unless your camera is attached to a tripod you need to be careful that the speed does not drop below around 1/125th second. If it does then you will need to either find some more light or increase the ISO so that the shutter speed is 1/125 or greater..

    (It *may* be possible to hand hold the lens at 1/60th especially if you are at the wide angle end of the lens' range but 1/125th is safer.)
     
  10. HeY iTs ScOTtY

    HeY iTs ScOTtY TPF Noob!

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    sorry i missed the part that said you want the image in focus my bad...smaller aperture lol. (larger number)
     
  11. PhotoXopher

    PhotoXopher TPF Noob!

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    My bad, I misread what he wrote as well... I guess I'm used to people asking about the other way around :lol:
     
    Last edited: Jul 8, 2009
  12. Battou

    Battou No longer a newbie, moving up!

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    Yes, that is exactly what he means, that will increase the DoF. This will require a longer Shutter speed or higher ISO.....you would prolly be better off adjusting shutter speed to compensate as much as possible. When the shutter speeds get too long to handhold (roughly 1/30) then bring up the ISO.
     

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