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  1. #1
    Senior Member
    hark's Avatar

    BIF & Tracking question

    BIF & Tracking question
    I set up all my bodies for U1 being BBF, Aperture Priority, AF-C, single point focus, and focus priority (instead of release priority). Today I worked on panning by following the birds. My focus point didn't move. As the birds flew, at times I couldn't keep the focus point on them. Is the focus point supposed to move? Or do I need to enable 3D tracking? And do you suggest using multiple focus points, group, or dynamic?

    Here are a couple from this afternoon. Since the sensor on my D750 is so much better than my D7100, I opted to take that body with my 300mm and 1.4x teleconverter. Both images have some significant crop as a result of using FX.

    BIF & Tracking question-dsc_5180-low-res.jpg

    BIF & Tracking question-dsc_5193-low-res.jpg


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    Cindy
    Flickr
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    My 2018 Thread
    Where the Spirit does not work with the hand, there is no art
    -- Leonardo da Vinci





  2. #2
    Senior Member
    FredKingston's Avatar

    Re: BIF & Tracking question

    set up all my bodies for U1 being BBF, Aperture Priority, AF-C, single point focus,
    It doesn't work with single point focus...

  3. #3
    Senior Member

    Re: BIF & Tracking question

    Quote Originally Posted by FredKingston View Post
    [COLOR=#333333]

    It doesn't work with single point focus...
    While technically correct this can be confusing because Dynamic Area focus only shows you a single focus point and it may appear in the viewfinder to be the same thing. What you want to use is Dynamic Area Focus which defines the number of points around the single point where the subject can "wander" in the viewfinder before the camera locks on something else. You want to set the area so it's as large as you need to keep the initial focus point in focus as you move with the subject. For BIF on my D500 (amazing focus system) I generally set the number of focus points to either 72 or the full focus area which runs the entire screen from L to R. On the D750 you're focus area is comparatively smaller so I would use D51 which will track the focus point throughout the full area as you shoot.

    There are some other tracking/focus lock settings that you'll need to play with to find what works best for you. Steve Perry has a great video on focus modes for Nikon cameras which has likely been linked here a bunch of times, but it's worthwhile enough that I'm happy to link it again.

    Thanks/Like hark Thanks/liked this post
     
    Jake

    Hippies Must Use Back Door ... No Exceptions

    D750, D500, D610, D800 @ IR 720nm, Sony a6000 (and a bunch of other stuff)

  4. #4
    Senior Member

    Re: BIF & Tracking question

    I've been on single point with bbf for quite awhile now. Its tough to keep that single point on a moving bird. I haven't done it too much. Just recently set up a U to try the dynamic modes with focus priority. No birds yet to try. The reason I set up a U is because on the d7100/d7200, the af-c focus priority is over-ridden when using the back button for af-on. So my U puts me back to shutter button mode so I can use af-c with focus priority.
    Test your d750 to see how it behaves with focus vs release priority in bbf. My old d7000 did let me choose af-c w/focus priority while using bbf. The 71 and 72 override the priority and give me release no matter what if using bbf.
    Thanks/Like hark Thanks/liked this post
     
    I must have a really good camera.

  5. #5
    Senior Member
    hark's Avatar

    Re: BIF & Tracking question

    Quote Originally Posted by FredKingston View Post

    It doesn't work with single point focus...
    Lol--wise guy! Just kidding. I found that out which is why I asked.

    Quote Originally Posted by BackdoorHippie View Post
    While technically correct this can be confusing because Dynamic Area focus only shows you a single focus point and it may appear in the viewfinder to be the same thing. What you want to use is Dynamic Area Focus which defines the number of points around the single point where the subject can "wander" in the viewfinder before the camera locks on something else....
    Ahh...so setting it with dynamic still shows the single point. Okay, now everything is starting to make sense. I actually watched this Steve Perry video yesterday before I asked but was still confused as to which setting works best. I guess when hearing there are multiple focus points, I only think about the group of points that all show up.

    I remembered seeing something in his video where the focus point moved, but it didn't register in my head. I've only ever used single point focus since switching to a DSLR so don't have experience with the other types of AF. Thanks for the explanation, Jake.
    Cindy
    Flickr
    and
    My 2018 Thread
    Where the Spirit does not work with the hand, there is no art
    -- Leonardo da Vinci



  6. #6
    Senior Member
    hark's Avatar

    Re: BIF & Tracking question

    Quote Originally Posted by nickt View Post
    I've been on single point with bbf for quite awhile now. Its tough to keep that single point on a moving bird. I haven't done it too much. Just recently set up a U to try the dynamic modes with focus priority. No birds yet to try. The reason I set up a U is because on the d7100/d7200, the af-c focus priority is over-ridden when using the back button for af-on. So my U puts me back to shutter button mode so I can use af-c with focus priority.
    Test your d750 to see how it behaves with focus vs release priority in bbf. My old d7000 did let me choose af-c w/focus priority while using bbf. The 71 and 72 override the priority and give me release no matter what if using bbf.
    I'll have to look into that, Nick. I thought I remembered seeing AF-C somewhere, somehow on the top display when using the D7100. Will check it out with all my bodies since all of them have U1 set up the same way.

    Question so I fully understand...when you say AF-C is overridden, you mean it won't allow focus priority and uses release priority instead?
    Cindy
    Flickr
    and
    My 2018 Thread
    Where the Spirit does not work with the hand, there is no art
    -- Leonardo da Vinci



  7. #7
    Senior Member

    Re: BIF & Tracking question

    Quote Originally Posted by hark View Post
    Question so I fully understand...when you say AF-C is overridden, you mean it won't allow focus priority and uses release priority instead?
    Yes, your af-c priority choice is overridden when bbf is set. So on your d7100, even though menu a1 is set to focus priority, you will get release priority. I don't think it is mentioned in the manuals.
    Thanks/Like hark Thanks/liked this post
     
    I must have a really good camera.

  8. #8
    Senior Member
    FredKingston's Avatar

    Re: BIF & Tracking question

    Just so we're clear... the moving focus points are only active while you're in AF-C mode... so with BBF, you have to hold the BB down continuously while tracking/panning the bird...

    Steve Perry also wrote a 500+ page PDF/eBook that, in detail, covers the process...(he even covers the settings for the pretty much all the Nikon camera models, including the newer D750 and D500. He also explains that he uses Single-point focus for most of his work...

  9. #9
    Senior Member
    hark's Avatar

    Re: BIF & Tracking question

    Quote Originally Posted by FredKingston View Post
    Just so we're clear... the moving focus points are only active while you're in AF-C mode... so with BBF, you have to hold the BB down continuously while tracking/panning the bird...

    Steve Perry also wrote a 500+ page PDF/eBook that, in detail, covers the process...(he even covers the settings for the pretty much all the Nikon camera models, including the newer D750 and D500. He also explains that he uses Single-point focus for most of his work...
    Fred, I have it set as BBF with AF-C but with single point focus. The point didn't move and track which is why I asked. According to Jake's reply, the focus points have to be set to Dynamic​, not single point. Only one point shows up when using the Dynamic setting but moves within the range specified by the number of total points selected. That's the concept I hadn't grasped. Before I posted yesterday, I watched the Steve Perry video that Jake linked, but at the time I didn't realize the dynamic setting would still only show one moving focus point.

    Haven't yet had a chance to change to the Dynamic setting, but I most certainly will change it and try it out. Most likely the focus point will then move and track in my viewfinder. I know you are trying to help...thanks for your input.
    Cindy
    Flickr
    and
    My 2018 Thread
    Where the Spirit does not work with the hand, there is no art
    -- Leonardo da Vinci



  10. #10
    Senior Member
    FredKingston's Avatar

    Re: BIF & Tracking question

    I wasn't trying to be a wise guy Cindy... just trying to point out where your problem was...
    Thanks/Like hark Thanks/liked this post
     





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