“On-Camera” Versus “Remote”
You can take pictures using a flash unit mounted on the camera accessory shoe or one or more remote flash units.
Camera-Mounted Flash Units
Take pictures using a flash unit mounted on the camera as described in “Using an On-Camera Flash” (0 Using an On-Camera Flash).
Remote Flash Photography
Take pictures with one or more remote flash units using wireless flash control (Advanced Wireless Lighting, or AWL) as described in “Remote Flash Photography” (0 Remote Flash Photography).