Experimenting with Nikon defocus control (DC)

Discussion in 'Digital Cameras' started by eNo, Feb 28, 2011.

  1. eNo

    eNo Guest

    Has anyone here played with this feature on either the Nikkor 105 f2.0
    or 135 DC lenses? It seems the results when keeping aperture and DC
    setting (number) matched are minimal (see http://esfotoclix.com/blog1/?p=1975).
    Has anyone played with combinations of aperture vs. DC settings that
    work well for blurring the background beyond what a given aperture
    normally would, and if so, what settings have you found to be
    effective?
     
    eNo, Feb 28, 2011
    #1
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  2. eNo

    Paul Furman Guest

    Thanks for sharing!

    I'm not clear if the 'front' setting is supposed to improve front OOF or
    the opposite.

    Changing the focus distance can have a dramatic effect on OOF circles so
    it might help to be even more meticulous about the focus point,
    difficult as that is.

    What I did to make it easier to compare, is crop the larger composites
    back to three and used irfanview to flip between them more easily. I've
    got some focus stacking software that could be used to even out the
    scale differences to make the comparison a tad smoother. Flipping like
    that is a very effective way of comparing frames. The reason for my
    first comment is, when doing focus stacks, I sometimes flip through the
    set and watch the OOF change and it's surprising! I would be glad to
    process a set like that, with originals for more detail if you'd like
    (remove hyphens(dashes) from my email).

    It would be interesting to see some foreground elements too. Something
    with shiny highlights.

    I did a study of a similar effect, which is a bit complicated to explain
    but the tape measure technique might be useful:
    http://www.flickr.com/photos/edgehill/5364815151/
     
    Paul Furman, Mar 1, 2011
    #2
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  3. eNo

    eNo Guest

    Interesting results over on your Flickr stream. Thanks for sharing.
     
    eNo, Mar 1, 2011
    #3
  4. eNo

    PeterN Guest

    The more thins change, the more they remain the same.
    I have a simple varifocus filter. It is a plain piece of optical glass.
    To get a haze effect I simply breath on it. after I place it on the
    lens, the haze remains the same. I get a variable blur simply by
    smearing some Vaseline of suntan lotion of a portion of the lens. they
    are cheap enough that if I cannot clean the mess off, so what.
     
    PeterN, Mar 3, 2011
    #4
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