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Sigma 30mm f/1.4 Focusing Problems

Discussion in 'Sony Alpha E-Mount Lenses' started by Richard Crowe, May 12, 2019.

  1. Richard Crowe

    Richard Crowe TalkEmount Veteran

    229
    Sep 14, 2018
    I tend to see some focusing problems with my Sigma 30mm f/1.4 Focusing Problems. The focusing at times tends to go in and out and sometimes results in images that are not in focus.

    I have been shooting in single shot mode with wide area. I have face detect selected and will get focus squares on peoples faces but, then the lens will hunt and I often end up with an OOF image. This happens both indoors in lower light levels and outdoors.

    This image was shot with my A6500 using ISO 320, f/5.6 at 1/250 second. There were focus squares on two of the faces but, the focus was going in and out and it looks like the lens has back focused because the greenery behind the subjects seems to be in better focus...
    30mm f-1.4.jpg
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  2. WNG

    WNG TalkEmount Hall of Famer

    Aug 12, 2014
    Arrid Zone-A, USA
    Will
    Hopefully someone with your combo has some advice to your focusing issue, sounds odd.
    I would suggest AF-C instead of AF-S, when using wide and face detect. From the shot, I assume it was a timer portrait. So, the camera must 'guess' on which face is the desired one to focus on. And any movement may lose focus. The fast lens means there's a longer throw of range to focus, thus hunts more in AF-S. Continuous focus should cut down the amount of focus hunting. I'd try an aperture of f/2.8-5.6 to give a sharper dof for the AF system.
     
    Last edited: May 15, 2019 at 11:37 PM
  3. Richard Crowe

    Richard Crowe TalkEmount Veteran

    229
    Sep 14, 2018
    I think that there might be a problem with this lens. At times it locks in focus using either AFC or AFS and at other times it hunts in and out. This occurs with both my A6400 and A6500 - so it is not the camera that is at fault...

    I have had problems focusing with my Sigma 19mm f/2.8 lens, which I am told should only be used in center focus.

    I have never been absolutely happy with the AF capabilities of Sigma lenses as a whole on DSLR cameras. As an example, the Sigma 85mm f/1.4 lens is a beautiful glass but, it will often not nail focus. I was hoping that this would be solved with the mirrorless line.

    I simply cannot live with on again - off again auto focus. The reason I bought a Sony A6500 and an A6400 is their great AF capabilities.

    My solution is to get rid of the Sigma lenses and to shoot with nothing but native Sony glass in AF or vintage glass in MF.
     
    • Like Like x 1
  4. WoodWorks

    WoodWorks Super Moderator Subscribing Member

    Dec 12, 2012
    Ashland, OR, USA
    David
    YMMV, but that's worked fairly well for me.
     
  5. WNG

    WNG TalkEmount Hall of Famer

    Aug 12, 2014
    Arrid Zone-A, USA
    Will
    I've had similar focus hunt on my 19mm f/2.8. But expected it somewhat from these older designs.
     
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