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Subject: "D7000 Dynamic Area AF - friend AND foe" Previous topic | Next topic
rasworth Basic MemberTue 29-Mar-11 01:56 PM
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"D7000 Dynamic Area AF - friend AND foe"
Tue 29-Mar-11 02:57 PM by rasworth

Austin, US
          

I have watched with interest the evolution of Nikon DSLR autofocus modes, from the D70 thru the D200 and D300, and now the D7000. In particular, I have observed the lack of information wrt dynamic area af. So I am creating this diatribe to attempt to clarify, or at least start some discussion.

I have experimented with, and read several references about, D7000 dynamic af, including the Nikon tutorials, Nikon manual, and Thom Hogan's ebook. Without exception all describe its usage wrt moving subjects, and none point out that the camera can't tell the difference between a fixed camera position with a moving subject, and a fixed subject with a moving camera. In the latter situation dynamic area af can be a plus or minus, depending upon the photographer's awareness or lack thereof.

As an af-on only (focus removed from the shutter release and transferred to the AE-L/AE-E button, always in continuous focus mode) focuser I avoid using dynamic area af for static subject shooting. The reason is I tend to keep my thumb pressed on the AE-L/AE-E button as I scan around the scene for the appropriate focus point, and if I am in 9/21/39 dynamic area af it is very easy to "hook" focus on the wrong object, particularly if it is closer than the final desired subject. Again, the camera can't tell the difference between a moving camera and a moving subject, and therefore will tend to lock on the object under the focus target at intial button press, even though one slides off to another target. IMO this is one of the reason for at least some of the complaints about D7000 mis-focusing.

On the other hand one can use dynamic area 3d to lock on one object, say the subjects eye, and recompose without losing the desired focus target. It's almost eerie to watch the focus rectangle jump back to the original focus point during recomposition of the scene. I haven't used this capability extensively, but in my limited experiments it seems to work well.

My main message is don't leave your camera in dynamic area af thinking that it won't affect static shooting and will be there for moving objects, particularly if you are an af-on only focuser. It can easily work against you, and therefore I recommend the default setting for one's D7000 to be single area af.

Added by edit - attached a slanted brick wall shot to illustrate the 3D 39 point capbility, started with the center rectangle on the tape and moved the camera, kept thumb pressed on AE-L/AF-L button and tape area remained in focus.

Added by second edit - I stand (or sit) corrected, upon re-reading Thom Hogan's ebook I found a reference to using 39 point 3D for reframing people shots.



Richard Southworth

Attachment #1, (jpg file)

  

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Replies to this topic
Subject Author Message Date ID
Reply message RE: D7000 Dynamic Area AF - friend AND foe
briantilley Moderator
29th Mar 2011
1
Reply message RE: D7000 Dynamic Area AF - friend AND foe
rasworth
29th Mar 2011
3
Reply message RE: D7000 Dynamic Area AF - friend AND foe
rasworth
29th Mar 2011
4
Reply message RE: D7000 Dynamic Area AF - friend AND foe
mholka
29th Mar 2011
2
Reply message RE: D7000 Dynamic Area AF - friend AND foe
PAStime Silver Member
30th Mar 2011
5
     Reply message RE: D7000 Dynamic Area AF - friend AND foe
rasworth
30th Mar 2011
6
          Reply message RE: D7000 Dynamic Area AF - friend AND foe
PAStime Silver Member
31st Mar 2011
7

briantilley Moderator Deep knowledge of bodies and lens; high level photography skills Nikonian since 26th Jan 2003Tue 29-Mar-11 02:58 PM
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#1. "RE: D7000 Dynamic Area AF - friend AND foe"
In response to Reply # 0


Paignton, GB
          

>Without exception all describe its
>usage wrt moving subjects, and none point out that the camera
>can't tell the difference between a fixed camera position with
>a moving subject, and a fixed subject with a moving camera.

In many situations, it is possible to distinguish between the two; in particular when your moving subject is in front of a static background.

If the camera is moving, everything in the frame changes position relative to it. If the camera is still, only the subject changes position and the background is static.

>As an af-on only (focus removed from the shutter release and
>transferred to the AE-L/AE-E button, always in continuous
>focus mode) focuser I avoid using dynamic area af for static
>subject shooting.

Agreed! Single-point AF is better for static subjects - which is what Nikon recommend on page 94 of the D7000 manual.

>On the other hand one can use dynamic area 3d to lock on one
>object, say the subjects eye, and recompose without losing the
>desired focus target. It's almost eerie to watch the focus
>rectangle jump back to the original focus point during
>recomposition of the scene.

I've not tried that. I wonder if it works as well on other Nikons?

Brian
Welsh Nikonian

  

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rasworth Basic MemberTue 29-Mar-11 04:21 PM
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#3. "RE: D7000 Dynamic Area AF - friend AND foe"
In response to Reply # 1


Austin, US
          

Brian,

I agree the photographer can usually distinguish between moving subject and moving camera, but my point was the camera does not differentiate between the two, thus the "trap" when using dynamic area af and AF-ON only technique.

It baffles me why Nikon chose to show the moving focus rectangle in the viewfinder for 3D, but not for the "simpler" 9/21/39 modes. If they had done so then it would be obvious when the focus slipped to another object.

Richard Southworth

  

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rasworth Basic MemberTue 29-Mar-11 04:56 PM
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#4. "RE: D7000 Dynamic Area AF - friend AND foe"
In response to Reply # 1
Tue 29-Mar-11 04:57 PM by rasworth

Austin, US
          

Brian,

I don't remember for sure, but I believe the 51 point 3D mode on the D300 did not show the moving focus rectangle when in continuous servo mode. The continuous visibility is what makes the mode "work" IMO, one always knows the focus target location.

I convinced my not-so-willing subject to go outside for a trial usage of the 39 point 3D mode, works very well particularly in outdoor lighting. Started focus on her face and panned sideways, snapped the picture. The rectangle stayed on her face.




Richard Southworth

Attachment #1, (jpg file)

  

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mholka Registered since 04th Jan 2011Tue 29-Mar-11 03:16 PM
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#2. "RE: D7000 Dynamic Area AF - friend AND foe"
In response to Reply # 0
Tue 29-Mar-11 03:17 PM by mholka

Brownstown Twp, US
          

My new D7000 is far more capable than this shooter is for sure. In the first few days I was having difficulty in deciding what AF mode and settings would work best for me.

I did find it a bit troubling at first that the focus would seem to jump around and often as not fall on everything BUT the subject I wanted.

Now I control the focal point.

I am getting better but I agree. In the past I rarely changed AF settings on my D300s, D90 or D80. I had them set up to work reasonably well in all situations.

With the D7000 I will need to be more conscience about what AF mode I use for any given situation.

I am also living of Nikonians as Thom's book has yet to arrive home!

Shoot, shoot and shoot some more!

--Martin
www.ExclusivePhotoWorks.com
Nikon Body's
D800e, D300s, D7000, D90, D80, F100

Lenses:
18 - 200 F3.5-5.6 VRII, 70-200 F2.8 VR II,
18 - 105 F3.5-5.6 VR, 18 - 135 F3.5-5.6,
35 - 70 F2.8, 50 F1.4, 70 - 300 F4-4.5,
Sigma 150-500 F5-6.3

Visit my Nikonians gallery.

Visit my Nikonians gallery.

  

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PAStime Silver Member Nikonian since 10th Feb 2009Wed 30-Mar-11 11:11 AM
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#5. "RE: D7000 Dynamic Area AF - friend AND foe"
In response to Reply # 2


Kingston, CA
          

I have become tired of trying to outguess the camera or predict what it will do when it is in automatic modes. I now mostly shoot with the single centered point as my AF target and use the AF-On button to decide when I want the camera to be focusing and when not. I have developed the habit of setting focus and then recomposing. This doesn't work well in two situations:

1. When recomposing significantly changes distance from camera to subject.
2. Sports shooting, when auto tracking by the camera does a lot better than me

Peter

  

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rasworth Basic MemberWed 30-Mar-11 01:23 PM
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#6. "RE: D7000 Dynamic Area AF - friend AND foe"
In response to Reply # 5
Wed 30-Mar-11 01:28 PM by rasworth

Austin, US
          

Peter,

I'm in agreement with you, generally use the same technique. I do intend to explore the 39 point 3D mode further, expressly to counteract the problem you stated in (1.). At least for my sample portrait photograph it allowed me to both recompose and maintain ongoing focus on the subject. It appeared to be an automatic version of manually moving the focus rectangle to one side of the frame.

Added by edit - at the risk of being redundant, I will say this is the first automatic mode I've encountered that seems to work well in conjunction with the AF-ON only technique.

Richard Southworth

  

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PAStime Silver Member Nikonian since 10th Feb 2009Thu 31-Mar-11 01:10 AM
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#7. "RE: D7000 Dynamic Area AF - friend AND foe"
In response to Reply # 6


Kingston, CA
          

Interesting Richard. I should give that mode a try again.

Peter

  

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