Autofocus
The NX100 employs a 15-point contrast-detection AF system. This newly developed system is faster than that found in the NX10. There are four modes, comprising single, multi, face detection and self-portrait. Having used the self-portrait mode, I am not sure whether it is any more effective than using the single-point AF for such a photograph. Face detection recognises up to 35 faces. The AF system can be used in either single or continuous focus modes, with the further option of manual focus.
The AF is responsive and accurate in good light but, despite the green assist lamp, it struggles in low contrast, with the contrast detection hunting back and forth as it searches for the focus point. This is not surprising for a camera of this level, and in these instances I used the manual focus, which has the usual useful enlarge function to aid accurate focusing. This enlarge tool is not available in video mode, and the contrast-detection AF can be distracting for videos as it moves back and forth.
