You may be confusing AF-S mode with single point mode. AF-S is selected by pressing the button in the center of the AF/M switch and holding it while spinning the rear command dial with your thumb until AF-S appears. The camera will then focus and lock for a single picture, as opposed to continuous focus for moving objects.
I think what you are after is selecting a single AF point rather than having the camera guess what should be in focus from among the 39 points. To do this, push and hold the AF button and spin the front command dial with your index finger. On the top LCD display you will see a large array of points, then a smaller array, then a single point. Hope this helps!
Are the other AF Area modes working properly? You should be able to select d-9 (Dynamic 9 point focus), d-21, d-39, or S. Each of these AF Area modes will be shown in the displays on both the viewfinder and the LCD.
Thu 06-Dec-12 02:22 AM | edited Thu 06-Dec-12 06:10 AM by jrp
I had the same problem. Hit your information button, then on the lefty side of the camera where it is A or M PUSH THAT BUTTON IN. LET GO OF THE INFORMATION BUTTON, spin the sub command dial or command dial, I forgot which, watch your information screen and the matrix metering picture will change with a dot in the middle. I believe that is what you want.
The images in your gallery are typically of moving subjects walking past you. The main focus issues will be around technique. My guess is a number of focus misses are quick grab shots, so you might want to try tracking the subject and releasing the shutter when the composition and look are what you want.
Since the subject is moving predictably, I would use either single point or 9 point dynamic focus. With a subject moving toward you, 3D tracking may be appropriate.
AF-C will allow the camera to fire rather than refusing to fire if focus is missed. You'll get more misses - but you will have images to assess your work. I'd use AF-C since the subject is moving.
This is the type of photography that can benefit from the AF-On approach to focus. You would focus and hold the button down to enable tracking of your subject while adjusting focus.
Thank you very much for your advises. I am trying to figure out myself about a D600 problem focusing system and and think that: 1. In a vertical position of camera, tracking range is short; 2. Subject moves past me so I needed to move and I do move with camera into a more appropriate position to keep an object in the center of frame. Thus we there have two movements i.e. a camera and the object. Of course, I will check out my options regarding AF system and will make it according your recommendation. David