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Back Button Focus for a moving subject

Discussion in 'Help Team' started by Darth Vader, Feb 20, 2017.

  1. Darth Vader

    Darth Vader Member

    When using Back Button Focus for a moving subject do I need to hold the button down all the time or just the once to get focus?
  2. MJB

    MJB Well-Known Member

    Whichever button you have assigned autofocus to, will behave like the half press on the shutter release (I'm assuming other brands work the same as my Canons), so yes you will need to hold the button.
  3. PeteRob

    PeteRob Well-Known Member

    All the time. You will need to set a continuous focus mode (A1 servo on Canon cameras). I find it very difficult to use back button focus for rapidly moving approaching subjects It is best used when the subject is intermittently obscured, e.g. moving behind something like a bird in a reed bed or tree. If thr subject is is obscured it can mean that when tracking with continuous focus the focus can jump forward (or sometimes backwards) if it loses the subject. My camera allows the focussing system to ignore interventions, provided they are brief, but it is sometimes better to take focus control away from the shutter button.

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