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Thread: D-5100 Back Button Focus

  1. #1

    D-5100 Back Button Focus

    I was wondering if this was typical? Sometimes after I focus using BBF and then maybe recompose and try to BBF again, the camera won't re-focus unless I half depress the shutter button first, then it will re-focus. FWIW, I have my shutter priority set to "Release" mode.

    Any thoughts on why this is happening and is it normal?

  2. #2

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    Re: D-5100 Back Button Focus

    I'm not familiar with the back button on the 5100. Is it an AF button or is it AE/AF-L button? If the latter, the -L stands for "lock". So it locks exposure and/or focus until you depress the shutter. In the higher end cameras you can customize the button function but as I said I'm not familiar with the 5100. Check the manual.

  3. #3

    Re: D-5100 Back Button Focus

    Quote Originally Posted by NorthernFocus View Post
    I'm not familiar with the back button on the 5100. Is it an AF button or is it AE/AF-L button? If the latter, the -L stands for "lock". So it locks exposure and/or focus until you depress the shutter. In the higher end cameras you can customize the button function but as I said I'm not familiar with the 5100. Check the manual.
    It's an AE/AF-L button but I have it reassigned to "AF-On" to perform the back button focus option.

  4. #4

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    Re: D-5100 Back Button Focus

    Hi Tommy,

    Just tested my D5100. Set its AE/AF-L button to "AF-On".
    AFC- Priority to release.
    AF-A AF area mode - Single. ( same results with AF-C )

    While holding down ""AF-On" button, it can continuously focus from near to far.
    When I focus on something and release the "AF-On" button, it can refocus again using
    the AF-On. But it won't focus even if I half-depress the shutter button.

    HTH

  5. #5
    Moderator Dave Humphries's Avatar
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    Re: D-5100 Back Button Focus

    I think you need to be in AF-C (continuous) mode to get the behaviour you (and I) expect - I assume you are, but if not, try this first.

    Beyond that ...
    Does the D5100 have a Custom menu option called "Focus tracking with Lock-on"? (it is a3 on D7100)
    It has Off (instant response) and 5 other steps between Short (1) and Long (5), this will insert a delay in refocusing when re-composing if not set to Off and it may even when re-pressing (the button set as) AF-ON.

    EDIT: actually not too sure either of those is relevant

    To rule out other causes; is the;
    light good?
    subject static?
    good contrasty edge?
    single focus point selected?

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