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  1. #1
    Junior Member

    Shuuter doesn't release using back button focus with AF-ON

    I just got my new D750 from Adroma, and immediately set it up using back button focus with AF-ON. One thing I have noticed that it behaves differently with my D7100 is when it is used in AF-S/Single point focus mode, if I press the back AE-L/AF-L button to lock focus, let my thumb go off and recompose my picture, then occasionally I am not able to fire shots successfully, the shutter simply doesn't release all the time. This only happens in single point mode, if I change it to auto or group area mode, then the shutter can always release successfully after recomposition.

    My other D7100 has the same settings, but I can always fire shots successfully without experiencing any shutter release problem. I am wondering if anyone has the same experience or I have a defective D750. Thanks for your help!

    Eric


    › See More: Shuuter doesn't release in my D750 using back button focus with AF-ON
    Last edited by hjensun; 05-18-2018 at 05:42 PM.



  2. #2
    Senior Member
    Bikerbrent's Avatar

    Re: Shuuter doesn't release in my D750 using back button focus with AF-ON

    Welcome aboard. Enjoy the ride.
    We look forward to seeing more posts and samples of your work.

    I am sure a D750 user will be along shortly to help you out.
    Brent: Poway, CA
    D7200, D200, F100
    Tokina 12-24mm
    Nikon 18-200mm
    Tokina 28-70mm f2.6-2.8
    Nikon 80-200mm f2.8
    Sigma 150-600mm
    Nikon 50 AF f1.8
    Tokina 100mm f2.8 Macro
    Nikon SB800

  3. #3
    Senior Member
    Texas's Avatar

    Re: Shuuter doesn't release in my D750 using back button focus with AF-ON

    One of the menu items is for "S" - it allows the choice of release / focus
    Perhaps that option is set for the focus.

    There's another menu option for "C" with the same choices, maybe it is set for release

    This is a quick wild guess, have not tested my D750's behavior yet
    Thanks/Like hjensun Thanks/liked this post
     
    D750, D90, D100, Nikon 1 J5
    (Once owned: EL, F2AS, D50, D200, D300s, and D7100)

  4. #4
    Junior Member

    Re: Shuuter doesn't release in my D750 using back button focus with AF-ON

    Quote Originally Posted by Texas View Post
    One of the menu items is for "S" - it allows the choice of release / focus
    Perhaps that option is set for the focus.

    There's another menu option for "C" with the same choices, maybe it is set for release

    This is a quick wild guess, have not tested my D750's behavior yet
    Yes, my D750 menu a2 (AF-S priority selection) is currently set as "Focus", and I understand it means the shutter won't release unless it got focus lock. The problem is after I pressed and released my thumb from the AF-ON button, I assume the focus should already be locked after the beep, so I should be able to press my shutter and fire the shot after I recomposed my picture. If I changed the a2 setting to "Release, then yes the shutter will always be released, but you won't hear the beep. As I said, this is not happening when you are using auto or group area focus with AF-S.

    Eric

  5. #5
    Senior Member

    Re: Shuuter doesn't release in my D750 using back button focus with AF-ON

    Your shutter is not firing because your camera is not seeing focus anymore when you recompose. This is what Texas mentioned above.
    Also, the textbook bbf technique is to use af-c and release priority. You are missing out on the full benefit of the technique using af-s and you are likely at the default of focus priority. The camera may not fire if you recompose with those settings.

    On the d7100 and d7200, the camera (oddly) overrides the a1 and a2 menu priority settings and you get release priority no matter what when you program the back button for af-on. So you didn't have to think about it on your d7100. Not sure what the d750 does but it probably sticks with the a1 and a2 menu settings. In any case, set af-c servo and also set menu a1 to release priority and you will be good to go for the full technique including focus/recompose.

    If you must use af-s with bbf for some reason, then you will have to set menu a2 to release priority. The reason to use af-c is because in effect it gives you both servo modes. That is the beauty of the technique. Hold the button down and you get continuous focus. Release the button and you get a simulated af-s mode where you can recompose or pre-focus on a location.
    Thanks/Like hjensun, Tami Jo Thanks/liked this post
     
    I must have a really good camera.

  6. #6
    Senior Member

    Re: Shuuter doesn't release in my D750 using back button focus with AF-ON

    Quote Originally Posted by hjensun View Post
    Yes, my D750 menu a2 (AF-S priority selection) is currently set as "Focus", and I understand it means the shutter won't release unless it got focus lock. The problem is after I pressed and released my thumb from the AF-ON button, I assume the focus should already be locked after the beep, so I should be able to press my shutter and fire the shot after I recomposed my picture. If I changed the a2 setting to "Release, then yes the shutter will always be released, but you won't hear the beep. As I said, this is not happening when you are using auto or group area focus with AF-S.

    Eric
    No to the first part. It will not remember that focus locked. In the multi point modes, a different point is likely seeing focus and satisfying the camera to allow firing.
    As for the beep, you won't get it when the technique is properly used.
    Thanks/Like hjensun Thanks/liked this post
     
    I must have a really good camera.

  7. #7
    Junior Member

    Re: Shuuter doesn't release using back button focus with AF-ON

    Hi Eric,

    I have the same problem. Do you know if the Focus/recompose works only with Group AF-S on D750? Is it a defect in D750?

    Thanks,
    Samanth.
    Last edited by samanth; 03-13-2019 at 11:52 PM.

  8. #8
    Happy to be Canadian
    Super Mod
    Marcel's Avatar

    Re: Shuuter doesn't release in my D750 using back button focus with AF-ON

    I'm not certain because I don't have the D750. But I think you have to disable the focus with the shutter button in order for what you are trying to achieve to happen. If the shutter button focus function is still enable, it's trying to focus where the focus point is, and since you have recomposed, it might be on something that hasn't got enough contrast or it starts hunting to acquire focus.
    Hope this helps.
    I'm beginning to see the LIGHT!
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  9. #9
    Junior Member

    Re: Shuuter doesn't release in my D750 using back button focus with AF-ON

    Quote Originally Posted by Marcel View Post
    I'm not certain because I don't have the D750. But I think you have to disable the focus with the shutter button in order for what you are trying to achieve to happen. If the shutter button focus function is still enable, it's trying to focus where the focus point is, and since you have recomposed, it might be on something that hasn't got enough contrast or it starts hunting to acquire focus.
    Hope this helps.
    Thanks, but I have bbf enabled and the half press shutter focus is de-coupled.

  10. #10
    Senior Member

    Re: Shuuter doesn't release using back button focus with AF-ON

    Quote Originally Posted by samanth View Post
    Hi Eric,

    I have the same problem. Do you know if the Focus/recompose works only with Group AF-S on D750? Is it a defect in D750?

    Thanks,
    Samanth.
    Af-s with shutter button will focus/recompose regardless of the focus area mode.
    BUT... if you are using bbf with af-s, that is not the typical bbf setup and it will not work in the way the technique is supposed to work. I'll stop short of saying it is wrong to use af-s with bbf. There may be some reason someone wants to do it that way, but it defeats the purpose of why most people use the technique.

    The typical bbf setup is using af-c with release priority (menu A1). The method of use is to hold down the back button for continuous focus. You can keep the back button depressed and track the subject, shooting as needed. Or you can hold the bb down and when you are happy with the focus, release the bb and recompose and shoot. This technique allows you to be in af-c mode but at any instant, release the button and recompose. It gives you instant access to a simulated af-s mode.

    If you were to set up bbf with af-s focus priority, recomposing while not holding down the bb will likely not allow shutter release. You could probably continue to hold down the back button while recomposing and that would let you recompose via af-s but that defeats the purpose of the "bbf technique". You would simply be using af-s mode activated by the back button only. You don't get the benefit of full time af-c with instant access to a simulated af-s. That is what most users want to achieve when using the "bbf technique".
    I must have a really good camera.





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