F/2.8 Depth of Field

Discussion in 'Beyond the Basics' started by LuckySo-n-So, Apr 24, 2009.

  1. LuckySo-n-So

    LuckySo-n-So TPF Noob!

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    Everything I've learned so far tells me that a photo taken at f/2.8 gives a very shallow depth of field.

    I saw this photo a couple of days ago and checked the EXIF data, which showed that it was taken with a Canon 50d, f/2.8, 1/640th, ISO 3200, 148mm focal length( I'm assuming a 70-200 2.8 IS L lens). The photo is copyrighted, so here is the link:

    http://farm4.static.flickr.com/3538/3469203556_e349e4c0c0_o.jpg


    What makes the depth of field so deep at this aperture? High ISO I'm guessing?

    BTW: I don't know if this guy is a pro or not, but he does capture some pretty good major college sports photos. His flickr ID is lsuconnman
     
    Last edited: Apr 24, 2009
  2. Steph

    Steph No longer a newbie, moving up!

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    No. Camera to subject distance. The farther the subject, the deeper the DOF.
     
  3. LuckySo-n-So

    LuckySo-n-So TPF Noob!

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    D'oh!! makes sense. :banghead:

    eta: do you sometimes feel like "even though even though you are playing with a full deck," someone replaces the Ace of Spades with an extra Joker just to F*** with you?
     
  4. Overread

    Overread has a hat around here somewhere Staff Member Supporting Member

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    ISO won't affect the depth of field - it mostly only affects the shutter speed and noise levels in a shot.

    Distance though is probably playing a key part in this shot - a shot taken at f2.8 in macro world will have a depth of field only milimeters wide - portrate distance a few cms - move to telephoto distances and it increases still. I think there are some depth of field calculators online that you can use to get an idea of what is the actual depth of field at different distances - I suspect also that focal length might be a contributing factor also
     
  5. Phranquey

    Phranquey TPF Noob!

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    Yup. The farther away the subject, the closer you get to the infinity focus, which will get you a much greater DOF.


    EDIT: BLESS IT, Overread!!!! I have now lost count how many times you jumped me on an answer.
     
  6. Chris of Arabia

    Chris of Arabia Herding cats since 1988... Supporting Member

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  7. Overread

    Overread has a hat around here somewhere Staff Member Supporting Member

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    :lol::lol:
    but Steph beat us both this time round
     
  8. Garbz

    Garbz No longer a newbie, moving up!

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    Aperture. Camera to subject, and subject to background create depth of field. Given a same aperture, and same sized subject, the longer the lens, the further the camera to subject distance becomes. Have a look at these all shot at f/2.8:

    28mm
    [​IMG]

    50mm
    [​IMG]

    200mm
    [​IMG]
     
  9. djacobox372

    djacobox372 No longer a newbie, moving up!

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    I'm "guessing" that a teleconverter was used on that shot as well, which turns it into an f4 lens.
     
  10. RyanLilly

    RyanLilly No longer a newbie, moving up!

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    Wouldn't a teleconverter show up in the Exif Data; maybe not specifically as "1.4 teleconverter" etc, but at least actual focal lenght of combined lens and converter? In any case with a canon branded converter it would still register as F/4, i beleive.
     
  11. Seefutlung

    Seefutlung TPF Noob!

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    Actually, ISO does not affect either shutter speed or aperture ... in generally terms, (none technical), adjusting one's ISO makes the sensor either more sensitive or less sensitive to light (more sensitive = less light is required for a "proper" exposure ... less sensitive = more light is required for a proper exposure).

    Typically one can adjust either the shutter speed or the aperture to accomodate changes in ISO.

    Gary
     
  12. Garbz

    Garbz No longer a newbie, moving up!

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    The Canon and Nikon ones do, the aftermarket ones don't.
     

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