Single Servo AF: Once the subject is in focus, focus is locked. Useful for recomposing the picture.
-Single servo AF - when focus is locked as long as the shutter release button is lightly pressed.
-Sizing - very dilute, gluey substance used to prepare surfaces for coating by filling in pores and giving even absorbance.
Single servo AF (AF-S)
Camera focus when shutter release button is half pressed and locks when the in-focus indicator (a solid dot) appears on the viewfinder status LCD.
Focus modes: Single Servo AF and Continuous Servo AF, and Manual
Focus Tracking: Automatically activated in Single Servo AF or Continuous Servo AF
Focus area: One - or a group - of 11 focus areas can be selected ...
With the F5 camera body, Focus-Priority s given to Single Servo AF mode while Release-Priority is given to Continuous Servo AF. Using Custom Setting, however, you can change the priority to Release-Priority Single Servo AF or Focus-Priority Continuous Servo AF.
There are three main AF modes: AF-S (~), AF-C (Continuous Servo AF) and AF-A (an Auto mode which selects between them depending on whether the subject is in motion). These are selected from the main information display screen, where you'll also be offered a Manual focusing option.
Three basic types of focus modes exist for AF cameras: ~, Continuous AF and Manual AF.
\A camera mode where the shutter cannot be released until the subject is in focus.
See also: What is the meaning of Camera, Finder, Aperture, Focusing, Light?