Back Button Autofocus (AF) for LUMIX GH3, GH4 and GX7

Discussion in 'Panasonic Cameras' started by lightning, Dec 13, 2014.

  1. lightning

    lightning Mu-43 Veteran

    335
    Jun 29, 2012
    Kerava, Finland
    Hi,

    has anyone tried this? I set my camera today and i tested, this works perfectly at least with GX7. Take a look if you haven't noticed this earlier. Very usefully for those who photograph action and sports. And those who think mirrorless can't shoot sports or action, you are just wrong =) At least latest Lumix cameras can shoot action and they can do it pretty darn well, IF you know what you are doing. So set your camera like it is link below. Please let me know how it worked for you =)

    https://www.youtube.com/watch?v=D9efy9V8aa8

    Few shot by using back button af:

    <a href="https://www.flickr.com/photos/graphiksi/15391805923" title="P1290667 by M S, on Flickr">"1024" height="769" alt="P1290667"></a>

    <a href="https://www.flickr.com/photos/graphiksi/15824176000" title="P1290724 by M S, on Flickr">"1024" height="769" alt="P1290724"></a>

    <a href="https://www.flickr.com/photos/graphiksi/15825415509" title="P1290725 by M S, on Flickr">"1024" height="769" alt="P1290725"></a>
     
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  2. tosvus

    tosvus Mu-43 Top Veteran

    632
    Jan 4, 2014
    Great tutorial!
     
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  3. tosvus

    tosvus Mu-43 Top Veteran

    632
    Jan 4, 2014
    This thread deserves a bump.. I started using this, after setting it up as my custom setting #2 on the gh3. I have to get used to it a bit more, but like it a lot.
     
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  4. ijm5012

    ijm5012 Mu-43 Hall of Famer

    Oct 2, 2013
    Pittsburgh, PA
    Ian
    It should also be noted that this works for the G6 as well.

    I have set my cameras up for sports shooting, and saved it to C1 on the mode dial. Makes it super quick to have the camera set up how I need it for shooting sports, and this back-button AF makes a big difference.
     
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  5. lightning

    lightning Mu-43 Veteran

    335
    Jun 29, 2012
    Kerava, Finland
    That is a good point, i am pretty sure this works also for the G5. Perhaps some G5 owner can confirm that..
     
  6. tkc9789

    tkc9789 Mu-43 Veteran

    345
    Dec 8, 2013
    Dallas, TX
    I tried setting C1 with the suggested settings on my GX7. But camera did not track subject for some reason.
    I have AF/AE set to AF on; AF-C; AF area to 1-area and shutter AF to off.
    I focused on a stationary subject, hold the AF/AE button, then move the camera back and forth. Subject will be out of focus.
    Wonder what I done wrong?
     
  7. ijm5012

    ijm5012 Mu-43 Hall of Famer

    Oct 2, 2013
    Pittsburgh, PA
    Ian
    This isn't for focus "tracking", where it tracks the object around the screen (that's what the focus tracking option is for when looking at the AF Mode screen). This technique is for focus "following", and is meant to be used with single point AF, where you pan with the subject to keep the subject within the AF box, or when the subject is coming towards/moving away from you. Think of a dog or race car, where you are either panning left/right, or the subject is coming towards you but you want to keep the subject in focus.
     
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  8. tkc9789

    tkc9789 Mu-43 Veteran

    345
    Dec 8, 2013
    Dallas, TX
    I think I'm still missing something here. If I have focus moved to AF/AE, have subject in focus, then hold down the AF/AE button (with subject in focus box) while moving the camera towards the subject, should this simulate subject "following"? My subject was out of focus during my tests.
     
  9. ijm5012

    ijm5012 Mu-43 Hall of Famer

    Oct 2, 2013
    Pittsburgh, PA
    Ian
    Set your autofocus mode to continuous, program your AF/AE button for AF-ON (so the button activates AF, not a half press of the shutter), and then change the setting so that a half press of the shutter release sets the exposure, and a full press releases the shutter. Have your AF target be the box, make it as small as possible, and position it over the target. Keep that box on the target as it moves, and shoot as you wish.

    I can confirm that this works as intended on my G6, and delivers a surprisingly high rate of keepers for a CDAF-only sensor.
     
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  10. tkc9789

    tkc9789 Mu-43 Veteran

    345
    Dec 8, 2013
    Dallas, TX
    I've tried with PL 20mm and 12-35mm.
     
  11. tosvus

    tosvus Mu-43 Top Veteran

    632
    Jan 4, 2014
    You didn't really verify whether you followed ALL the steps. For instance, if you don't set the camera in AFC it won't work. If you don't turn off AF on shutter, that will override your focus as you snap, and there is also another AF setting on the AEL button that you need to make sure you don't use.
     
  12. lightning

    lightning Mu-43 Veteran

    335
    Jun 29, 2012
    Kerava, Finland
    Also AFC doesn't work on Panny 20mm
     
  13. tkc9789

    tkc9789 Mu-43 Veteran

    345
    Dec 8, 2013
    Dallas, TX
    I double checked and can confirm that the C1 setting has all 4 settings configured correctly. I also noticed that for some reason, as soon as I press and hold the AF/AE button, focus mode changes from AFC to AFS. Maybe that's the issue?
     
  14. excman

    excman Mu-43 Veteran

    380
    Dec 16, 2012
    Odsherred, Denmark,
    Jorgen
    On Gx7 try to set "Quick AF >> ON". I am quiteshure it will work
     
  15. tkc9789

    tkc9789 Mu-43 Veteran

    345
    Dec 8, 2013
    Dallas, TX
    That did it!! Thank you.
     
  16. Darren Bonner

    Darren Bonner Mu-43 All-Pro

    May 1, 2013
    Poole UK
    I have done this on my GX7 and I have got it working, though I found it worked better AFF than AFC, I would be interested in hearing other peoples opinion about this.

    I have also had a look on the G5, but it does not give you the option to focus with the AE/AF button.
     
  17. ripleys baby

    ripleys baby Straw clutcher

    609
    Aug 10, 2011
    I've have back button focus on my GH3 for a while. I reverted back to shutter button because I thought I didn't like it but I soon changed back again. I'm going to stick with it even though I find the ae/af button awkward to reach.
     
  18. T N Args

    T N Args Agent Photocateur

    Dec 3, 2013
    Adelaide, Australia
    call me Arg
    Just don't hand you camera to a friend to take a shot of you with this setup! :biglaugh:
     
  19. sgreszcz

    sgreszcz Mu-43 Veteran

    439
    Oct 7, 2012
    Does this back-button C-AF setup work with multiple-shot drive mode or do you just have to keep pumping the shutter button while holding the back button focus?
     
  20. ripleys baby

    ripleys baby Straw clutcher

    609
    Aug 10, 2011
    Yes it does. No shutter pumping required
     
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