Max Shutter speed
Nikon D3100 can shoot continuously at max speed of upto
3.0fps and has max shutter speed of
1/4000 sec .
Flash
D3100 has a built-in flash, and it also has a flash shoe to mount your external flashes too.
Check our Camera Flashes Page to find out more about the available on-camera and macro type flashes for the Nikon D3100.
Built-in Flash of Nikon D3100
Focusing
Nikon D3100 features both Contrast Detection and Phase Detection autofocus (AF) systems which ensures speed and accuracy of focusing in most situations. The AF system has 11 focus points and 1 of these sensors are of Cross-type. Cross-type sensors locks focus faster and more accurate compared to single type sensors.
Nikon D3100 also features
Face detection AF where it intelligently detects the faces in the frame and locks the focus automatically.
User Manual here
