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Focus question

  • 22-09-2008 8:38am
    #1
    Morrisseeee
    Registered Users, Registered Users 2 Posts: 5,146 ✭✭✭


    Could someone explain the difference in these 2 photo pls.
    One has horizontal focus & the other vertical.
    Note: 2 diff lenses, camera was held upright.

    Zuiko 14-42mm

    328AAC8DDD854F678B5E7C6300A4909D-500.jpg

    Centon 50mm F1.7

    E94C1CE49048484FBD3A5BDB9CC86FC8-500.jpg


Comments

  • #2
    ThOnda
    Registered Users, Registered Users 2 Posts: 4,699 ✭✭✭ThOnda


    The difference is that there is a piece of dirt in the first picture and a mosquito in the second one.
    Or if you meant some other difference, you should specify your question a little more ;)


  • #3
    CabanSail
    Moderators, Category Moderators, Arts Moderators, Entertainment Moderators Posts: 9,047 CMod ✭✭✭✭CabanSail


    I think the question is why the band in focus is horizontal on one image & vertical on the other?

    With a narrow DOF the only things in focus are in a hemisphere which is equidistant from the lens. This can be assumed to be a plane (flat area) as the distance is larger.

    In the two images shown that plane is vertical in one & horizontal in the other. It has nothing to do with the lens you are using but rather the subject in the photo.


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