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Thread: Hyperfocal Distance Question

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    Hyperfocal Distance Question

    My depth of field calculator tells me that if I take a photo of an object (lets say a landscape) & that object is approx 200M away, (I use a Canon 7D with f-stop at 10 & focal length at 15mm) that my hyperfocal distance is at 1.2 M. So if I focus at 1.2M, then from 0.6m to infinity should be in focus. Does that sound correct?? I have been reading about focusing somewhere 2/3rds of the distance to the object to get sharp pictures. 1.2M away? That sounds too close! Peoples thoughts please.....
    Last edited by Robbo7D; 10-05-2011 at 12:15pm.
    Robbo (Neil)

    Canon 7D, Canon 24-105mm f4 L, Canon 18-200mm IS, Canon 18-55mm, Canon 70-300mm, Canon 50mm 1.4 USM, Sigma 10-20mm UWA Canon 400D

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    Arch-Σigmoid Ausphotography Regular ameerat42's Avatar
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    The 2nd bit sounds optimistic, Robbo. The closest I can approach your figures is with my shortest lens, an f=28mm:

    Subject distance "infinity"
    f=28mm
    f/11
    Hyperf approx: 1.2m to infinity.

    Subject distance 1.2 m
    f=28mm
    f/11
    Hyperf range approx: 0.8m to 2m

    Did you post a link to this calculator in any other thread?
    Am.
    Last edited by ameerat42; 10-05-2011 at 1:26pm.
    CC, Image editing OK.

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    Arch-Σigmoid Ausphotography Regular ameerat42's Avatar
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    Well, I might have to eat a hat. I just found THIS HFD calculator and approximated your settings.
    Here's the result... (Screen print from http://www.nikonians.org/html/resour...erfocal2.html0 )
    Attached Images Attached Images

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    Quote Originally Posted by ameerat42 View Post
    The 2nd bit sounds optimistic, Robbo. The closest I can approach your figures is with my shortest lens, an f=28mm:

    Subject distance "infinity"
    f=28mm
    f/11
    Hyperf approx: 1.2m to infinity.

    Subject distance 1.2 m
    f=28mm
    f/11
    Hyperf range approx: 0.8m to 2m

    Did you post a link to this calculator in any other thread?
    Am.
    Ameerat42,

    Calculator is an app for my Android phone. I have used a focal length of 30mm in this example. (please note that subject is 5000 M (infinity)

    Subject distance: 5000 M (infinity)
    f=30mm
    f/11

    hyperf distance= 4.34m

    So if I focus 4.34 M away I should have sharpness from 2.17m to infinity. Agree?

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    id always focus on something 2/3 into the frame personally
    Darren
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    Thanks Guys,

    Gives me a good opportunity to experiment & get out there & test some theories.

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    Arch-Σigmoid Ausphotography Regular ameerat42's Avatar
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    While I was "calculating" with my f=28mm lens.... Yes, it would seem to be right, but I'd try some actual shots.
    Here are my "test results"...
    Am.
    Attached Images Attached Images

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    Ausphotography Site Sponsor/Advertiser OzzieTraveller's Avatar
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    G'day Neil [& AM]

    Your original thoughts are pretty close ...

    Firstly one of many standard optical definitions - "infinity" for a camera lens is taken as being 1000 times the focal length
    Focus is deemed to be "in-" or "out-of" when the so-called "Circle-of-confusion" becomes "unclear" [but don't let this worry you]

    Hyperfocal Distance [HD] can be calculated [as per AM's diagrams], and comes closer to the camera position as the lens is stopped down
    If you focus upon the Hyperfocal Distance, then your Depth-of-Field is exactly half the distance between the camera and the HD thru to infinity

    Thus - looking at it in reverse - DoF is 1/3 before the point of focus and 2/3 behind the point of focus

    Hope this helps [or at least adds to your level of confusion]
    Regards, Phil
    Of all the stuff in a busy photographers kitbag, the ability to see photographically is the most important
    google me at Travelling School of Photography
    images.: flickr.com/photos/ozzie_traveller/sets/

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