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Depth of Field and Aperture question

Discussion in 'General Technical Discussion' started by icetraxx, Jul 16, 2005.

  1. icetraxx


    May 7, 2005
    I do not know the term used to discribe my question. Does any one know the apature on the 70-200mm, 85mm1.4, 17-55mm where everything is in focus. For example, when shooting landscapes the whole depth of field is in focus? Is there such an apature or does it vary with each shot.

    I am traveling to vegas on monday with the wife and while she is working I'm headed off to the Grand Canyon, Hoover Dam, and possibly Death Valley. I'm bringing all of the lens' listed below.

    70-200mm, 17-55mm, 85mm 1.4
  2. nfoto

    nfoto Guest

    You mean hyperfocal distance. This is the distance setting, D, specific for each focal length *and* aperture which has depth-of-field extending from D/2 to infinity.

    Lenses used to have colour-coded marking for the hyperfocal settings, but they mostly are gone with the onslaught of AF. You can search on the net for DOF calculators, though.
  3. marc

    marc Guest

    bjorn, gave you the correct answer

    may i attempt to make it easier or simple

    if you want less dof use larger apertures

    if you want more use smaller apertures

    i would look up a dof chart on the web, just google

    depth of field

    love your trip, have a good time
  4. icetraxx


    May 7, 2005
    Bjorn thanks for the explanation. I could not think of the term to do a search.

    Mark thanks for the example. I know about the apatures and DOF. I was just wondering if there is a specific one best for a lens.

    Thanks again,
  5. marc

    marc Guest

    larry, dof only affects the relationship of your subject to the rest of the photo

    it is really what you want to see

    you may be thinking of at what aperture will i get the best focus and sharpest image

    this is different than dof

    you are using three really great lens

    if you shoot those lens and almost any aperture, your results will be terrific.

    it really depends on your ability
  6. icetraxx


    May 7, 2005
    I was talking about the hyperfocal distance. I found a cool little calculator. This is the explanation it gave:
    "The Hyper Focal Distance is the focus point, such that anything between half the distance to the focus point and infinity is in focus. So, for example, if for a given film format, focal length lense and f-stop the hyper focal distance is 6 feet, if you focus the camera at 6 feet, everything between 3 feet and infinity will be in focus. That is how you get the neat pictures of a small rock in the near foreground to be in focus, while the beautiful mountains in the background are also sharp."

    It will be a little challange for me out there in the bright sunlight. I am used to taking pictures of dance recitals and competitions.
  7. Iliah


    Jan 29, 2005
    "everything between 3 feet and infinity will be in focus" - should be "everything between 3 feet and infinity will be reasonably sharp". :) 
  8. PJohnP


    Feb 5, 2005
  9. Iliah


    Jan 29, 2005
    For me the best part of it is that explicit input of CoC is allowed. I think that usual 20 mkm is too large for high resolution digital cameras when printing bigger then 4 x 5".
  10. So what is the matematical formula for figuring out the Hyperfocal distance. I wanted to do an Excel sheet for myself to get some common distances and aperturters to get to know my top lenses by heart.

    thanks for the help
  11. Chris101


    Feb 2, 2005
  12. Gale


    Jan 26, 2005
    Viera Fl

    I have been reading Vivid Light mag since it came out.

    Sorry MOOSE is not writing for them any more. I just Love the "MOOSE"
  13. stm69


    Aug 10, 2005
    Thanks too, lot of information to digest. Trying to ballpark 1/3 distances sounds like an acquired skill.

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