DOF & Lens Focusing Question

Discussion in 'Beyond the Basics' started by cumi, Nov 7, 2006.

  1. cumi

    cumi TPF Noob!

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    Hi!

    I have a question: let's say, a lens (Nikkor 18-70 on my D70s) has a hyperfocal distance at X meters (with given F, focal length, etc). What happens, if I have a subject beyond this distance?

    Options:
    - The camera/lens focus to the subject, so the "near distance" of DOF will be "farer" (beyond of the half of the hyperfocal distance), so I loose on DOF.
    - The camera/lens stil focuses to hyperfocal, because it makes no sense to focus beyond it...

    Thank you.
     
  2. fightheheathens

    fightheheathens TPF Noob!

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    im gona guess your lens will focus on the far object.
    using manual focus will solve this problem.
     
  3. cumi

    cumi TPF Noob!

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    :grumpy: That what I was hoping not to do.

    Example:

    at 18mm, F3.5
    the hyperfocal distance is = 4,65m
    near (DOF) distance = 2,325m

    but if I focus to 100m the near (DOF) distance = 4,42m

    When doing everything manually, I have always to know exatcly the hyperfocal distances...
     
  4. Torus34

    Torus34 No longer a newbie, moving up!

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  5. cumi

    cumi TPF Noob!

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    Thanks, but I know this site and all the calculations.

    What I don't know is, if the newer lenses or cameras can focus automatically to hyperfocal distance.
     
  6. markc

    markc TPF Noob!

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    As far as I know, they all focus on the subject. Using hyperfocal distance can be useful, but the sharpest part of the image will still be the focal point. The DOF area is where most people won't notice it getting blurry much, but it still does the further you get from the focal point. I think the manufacturers are taking the safe and easy way out. Trying to tell the camera what your intent is with hyperfocal can get complicated. Some do have a DOF feature, where you focus on a spot and press the shutter halfway, focus on an other spot and press the shutter halfway, and then the camera chooses the right aperture to have both in focus.
     

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