Max Shutter speed
Panasonic ZS1 can shoot continuously at max speed of
3 fps and has max shutter speed of
1/2000 sec.
Flash
Unfortunately ZS1 doesn't have an external flash shoe so you are limited with the built-in flash.
Focusing
Panasonic ZS1 features a Contrast Detection autofocusing system. The AF system has 11 points to choose from. Panasonic ZS1 also features
Face detection AF where it intelligently detects the faces in the frame and locks the focus automatically.