Focal length and depth of field

Discussion in 'Photography Beginners' Forum' started by JClishe, Jun 17, 2009.

  1. JClishe

    JClishe No longer a newbie, moving up!

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    I read something the other day that said something to effect of, wider lenses produce greater depth of field. I'm trying to wrap my head around what this means in practice.

    Lets say for example that I shot something at 25mm, f/5. Then I moved back about 10 feet or so and shot the same subject at 50mm, f/5. Lets say that I was able to compose the exact same shot (or very similar) with the longer lense as I did with the wider lense and physically closer to the subject. So in other words I have 2 photos, same composition, same aperture, different focal lengths.

    Is the depth of field going to appear deeper or shallower in either of the pictures based on the differing focal lengths? Is this question making sense? :)

    Jason
     
  2. Samanax

    Samanax TPF Noob!

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  3. Dao

    Dao No longer a newbie, moving up!

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  4. kundalini

    kundalini Been spending a lot of time on here!

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    By design, UWA lenses give a greater DoF even at wide apetures moreso than "normal" lenses. I've never attained bokeh with my 12-24mm.

    This was taken at 12mm, f/4.5. It's not much of a comparison because I don't have a subject close, but I like the photo. :biggrin:
     
  5. lvcrtrs

    lvcrtrs TPF Noob!

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    Dao - that calculator is neat. Great visual tool plus it's neat how you can pick the actual camera you use.
     
  6. DiamondSCattleCo

    DiamondSCattleCo TPF Noob!

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    Has anyone found a depth of field calculator for the PocketPC? I understand how it all works together, but it would be nice to have a "starting" point in the field until I get used to each of my lenses.

    Rod
     
  7. JClishe

    JClishe No longer a newbie, moving up!

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    According to the calculator, a 25mm lens at f/4.5 produces 9.9ft of DoF, while a 55m lens at 4.5 produces a DoF of 1.7ft.

    This answers my question perfectly, thanks DAO!!
     

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