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GET TO KNOW YOUR CAMERA & MASTER IT

Nikon D7100, D7000 (Open)

topic #22720

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Subject: "RE: Wide-area AF assist"

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Gray_star Registered since 17th Dec 2012	Mon 24-Dec-12 12:36 AM
52 posts

#17. "RE: Wide-area AF assist"
In response to In response to 16

>So, if AF-A always starts in AF-S, what happens to the area
>mode if i have selected dynamic area AF? Is dynamic area
>(where the camera considers info from the focus points
>surrounding the selected focus point) disabled? Or does the
>camera get confused?

When using AF-A, if the camera switches to AF-C mode, then the Area-AF mode will come into play and the selected mode should be used.

With Dynamic area-AF, the camera will determine the point of focus using the selected focus point only. Once a focus indicator is achieved, the camera will track your subject and adjust focus (in AF-C or AF-A in AF-C mode.) If your subject were to momentarily move away from the selected focus point, and the camera recognizes this, then the camera will use the surrounding focus point to pickup your subject and maintain focus. The purpose of this function is to prevent the AF system from focusing on the background, just because your subject got away from you momentarily.

ViewNX will indicate the active focus point if you happen to take the picture while your subject was under one of the surrounding focus points.

Note that this is not tracking. Exposure is still based on the primary focus point (your selected focus point.) The idea is to keep you from losing your focus while you get the subject back under the correct focus point.

I hear that the camera loses the subject more often when 21 and 39 points are selected...probably because there's a lot more processing going on with all those points. In any case, 9-point seems the most popular.

> Is it better to simply select AF-Area
>mode = single point, when using the SB-600?

It doesn't make a difference. When the camera is in AF-S mode (either by having AF-S selected or the AF-S mode of AF-A) then all the Area-AF modes act like Single Point. So there's no need to switch.

Single point is useful with AF-C when you DO want the AF to adjust immediately to a new subject. This is useful when "hunting" through the viewfinder.

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Wide-area AF assist [View all] , GeorgCantor

, Fri 21-Dec-12 03:07 AM

Subject	Author	Message Date	ID
RE: Wide-area AF assist	Gray_star	21st Dec 2012	1
RE: Wide-area AF assist	GeorgCantor	21st Dec 2012	2
RE: Wide-area AF assist	Gray_star	21st Dec 2012	3
RE: Wide-area AF assist	GeorgCantor	21st Dec 2012	4
RE: Wide-area AF assist	Gamecocks	21st Dec 2012	5
RE: Wide-area AF assist	Gray_star	21st Dec 2012	6
RE: Wide-area AF assist	GeorgCantor	21st Dec 2012	7
RE: Wide-area AF assist	GeorgCantor	21st Dec 2012	8
RE: Wide-area AF assist	Gray_star	21st Dec 2012	10
RE: Wide-area AF assist	Gray_star	21st Dec 2012	9
RE: Wide-area AF assist	dm1dave	21st Dec 2012	11
RE: Wide-area AF assist	GeorgCantor	22nd Dec 2012	12
RE: Wide-area AF assist	GeorgCantor	23rd Dec 2012	13
RE: Wide-area AF assist	Gray_star	23rd Dec 2012	14
RE: Wide-area AF assist	GeorgCantor	23rd Dec 2012	15
RE: Wide-area AF assist	GeorgCantor	24th Dec 2012	16
RE: Wide-area AF assist	Gray_star	24th Dec 2012	17
RE: Wide-area AF assist	GeorgCantor	24th Dec 2012	18
RE: Wide-area AF assist	GeorgCantor	25th Dec 2012	19
RE: Wide-area AF assist	Gray_star	26th Dec 2012	20
RE: Wide-area AF assist	GeorgCantor	26th Dec 2012	21
RE: Wide-area AF assist	Gray_star	27th Dec 2012	22
RE: Wide-area AF assist	GeorgCantor	27th Dec 2012	23
RE: Wide-area AF assist	Gray_star	28th Dec 2012	24
RE: Wide-area AF assist	GeorgCantor	28th Dec 2012	25
RE: Wide-area AF assist	Gray_star	28th Dec 2012	26
RE: Wide-area AF assist	km6xz	28th Dec 2012	27
RE: Wide-area AF assist	Gray_star	28th Dec 2012	28
RE: Wide-area AF assist	GeorgCantor	28th Dec 2012	29
RE: Wide-area AF assist	GeorgCantor	28th Dec 2012	30
RE: Wide-area AF assist	Gray_star	28th Dec 2012	31
RE: Wide-area AF assist	GeorgCantor	28th Dec 2012	32
RE: Wide-area AF assist	GeorgCantor	30th Dec 2012	33