Sun 22-Apr-12 07:13 PM | edited Sun 22-Apr-12 07:20 PM by JosephK
When an even number of subjects in the frame, there is normally nothing in the center of the frame to focus on since the two subjects are on the sides of the center. Here you need to either pick an off-center focus point on one of the middle subjects or focus on one of the subjects then recompose the frame.
For two people standing side by side, f/5.6 might be a good place to start for depth of field (the amount in focus from front to back). If one is behind the other, you will need more depth of field. Don't forget you have a DOF preview button that will show you what the scene will look like when stopped down.
For focus modes, I run the camera using the AF-ON button always in AF-C mode. I get continuous focus with press-and-hold, AF-S simulation using press-and-release. On a still subject I might shoot single-point, but for people shots normally I use dynamic 9 or 21 point. (My default configuration is sports shooting.)
---------+---------+---------+---------+ Joseph K Seattle, WA, USA