B] Fine-tuning focus
Accurate focusing is, of course, vital for sharp pictures. So, once you’ve settled on the best focus mode for the job (see below), switch the AF-area mode to single-point AF rather than auto-area AF. You can then use the multi selector to select a specific AF point in the viewfinder.
Use manual focus and Live View’s magnification feature for the most accurate, but slowest, focusing
Auto-servo AF (AF-A) This detects whether the subject is stationary or moving, switching between the two AF modes accordingly
Single-servo AF (AF-S) Once the camera has achieved focus it will stay locked, as long as you keep light pressure on the shutter release
Continuous-servo AF (AF-C) Designed for tracking moving subjects, this mode sees the camera continuously adjusting the focus distance