Dynamic-Area AF vs Group Area AF

Started May 10, 2014 | Questions
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ngtszhodavid
ngtszhodavid Contributing Member • Posts: 661
Dynamic-Area AF vs Group Area AF

For D4S, under AF-C.

Is my understanding on the below correct:

(I read the manual but it wasn't that clear to me)

For Dynamic-Area AF (9/21/51 pts), basically I need to lock on the subject to focus FIRST at the center point, then in case the subject moves and leaves the corresponding other points would 'assist' in the focus accordingly (in reference to where the initial middle box focus is pointed at), so key is to get initial focus point right initially.

while

For Group Area AF, the 5 squares basically acts as potential focus points and once I press the shutter, the camera will then pick 1 of the focus squares as the only focus, hence increases likelihood of getting the 'initial' focus point right (though subsequently no 'assist focus points' like the above).

That's correct right?

(on a side note i read in the link below that for Group Area focus it tends to focuse on the closest object within the area defined by the 5 brackets in the focus group http://www.naturalart.ca/voice/blog.html ))

 ngtszhodavid's gear list:ngtszhodavid's gear list
Nikon D4S Nikon AF-S Nikkor 24-70mm f/2.8G ED Nikon AF-S Nikkor 70-200mm f/2.8G ED VR II Nikon AF-S Nikkor 85mm f/1.4G
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Nikon D4S
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jeminijoseph Veteran Member • Posts: 5,858
I'm very curious about this too

Will wait for replies. I use D4 now. Want to know what I'll get with my next Nikon camera. (D4s or D5 or D400). If Nikon cannot compete with Canon's top models, I 'll switch with next upgrade.
--
Thanks
Jemini Joseph

http://wildbirdimages.com/favorites.aspx

 jeminijoseph's gear list:jeminijoseph's gear list
Nikon D500
lock Veteran Member • Posts: 6,183
You can move the set of af points in dynamic mode.

So it is not always the center af sensor, but the 'primary sensor' is always the central one in any set.

Lock

ngtszhodavid
ngtszhodavid OP Contributing Member • Posts: 661
Re: You can move the set of af points in dynamic mode.

Right. I should be more clear. I mean center of the set which doesn't necessary be the  center of sensor

ock wrote:

So it is not always the center af sensor, but the 'primary sensor' is always the central one in any set.

Lock

 ngtszhodavid's gear list:ngtszhodavid's gear list
Nikon D4S Nikon AF-S Nikkor 24-70mm f/2.8G ED Nikon AF-S Nikkor 70-200mm f/2.8G ED VR II Nikon AF-S Nikkor 85mm f/1.4G
jjnik Senior Member • Posts: 1,319
Re: Dynamic-Area AF vs Group Area AF

ngtszhodavid wrote:

For D4S, under AF-C.

Is my understanding on the below correct:

(I read the manual but it wasn't that clear to me)

For Dynamic-Area AF (9/21/51 pts), basically I need to lock on the subject to focus FIRST at the center point, then in case the subject moves and leaves the corresponding other points would 'assist' in the focus accordingly (in reference to where the initial middle box focus is pointed at), so key is to get initial focus point right initially.

while

For Group Area AF, the 5 squares basically acts as potential focus points and once I press the shutter, the camera will then pick 1 of the focus squares as the only focus, hence increases likelihood of getting the 'initial' focus point right (though subsequently no 'assist focus points' like the above).

That's correct right?

yes, that's correct!

(on a side note i read in the link below that for Group Area focus it tends to focuse on the closest object within the area defined by the 5 brackets in the focus group http://www.naturalart.ca/voice/blog.html ))

I've seen that is true in my use of the D4s as well.

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