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Vertical Depth of Field?

  • 20-04-2006 12:02pm
    #1
    CoolBoardr
    Closed Accounts Posts: 189 ✭✭


    I was taking some photos inside a church the other day and it made me wonder about vertical depth of field (if there is such a thing).

    It was quite dark inside so I wanted to use a larger aperture (around f3 or f4) to maximise the light, but the church walls that i was photographing were really high, so I wasn't sure whether this would throw some of the wall out of focus (which I didn't want). I ended up setting the aperture to f/13 which underexposed the photos, but I can fix them up in photoshop.

    So my question is - if I am shooting a vertical wall and focus at the bottom of the wall using say f/3, will this make the top of the wall out of focus?

    Hope this makes sense, I guess I can always go out and try it but I thought i'd get some expert advice here first.


Comments

  • #2
    Alun
    Registered Users, Registered Users 2 Posts: 21,499 ✭✭✭✭Alun


    Well it's not really any different to 'normal' depth of field is it? I mean, if you're standing at the bottom of a high wall looking up, the top of the wall is going to be further away from you, and if you have a shallow DOF and focus on the bottom of the wall, then the top may well be out of focus.

    Imagine if you rotated the whole shooting match through 90 degrees, say if you were shooting something like the Berlin Wall at a bit of an angle, and focussing on the wall immediately in front of you, it would be exactly the same situation. Vertical or horizontal or anything in between isn't important.


  • #3
    DotOrg
    Registered Users, Registered Users 2 Posts: 1,557 ✭✭✭DotOrg


    to change the depth of field in vertical aspects you need a tilt and shift lens, which makes planes of focus, not necessarily parallel to the plane of the sensor.

    they're expensive but great fun to get effects that are very subtle but can make for really interesting shots.

    the most interesting examples of using one are at:
    http://blog.so-net.ne.jp/photolog/archive/c22183


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