(Flash Off)

Flash does not operate.

(Autoflash)

Flash automatically operates in dark locations or when there is a backlight.

(Fill-flash)

Flash always operates.

(Slow Sync.)

Flash always operates.

The shutter speed is slow in a dark place to clearly shoot background that is out of flash light.

(Rear Sync.)

Flash operates before the exposure is completed every time you trigger the shutter. Rear sync shooting allows you to shoot a natural image of the trail of a moving subject, such as a moving car, etc.