For those moments or whole shoots where you're not assisted by a focus puller, the C400 offers Canon's dual-pixel autofocus function, which has been improved by the wider area of the back-illuminated CMOS sensor, which is available for autofocus. Intelligent tracking lets you follow the eyes, face, head, and body areas of a subject with increased accuracy. For nature documentary shooters, the C400 provides the ability to detect the eyes, face, or body of select animals without being affected by their size or facial orientation.