SIGMA EF-630 Electronic Flash for Cameras - Manual (Page 3)

Wide-Angle Illumination Coverage
SIGMA has further extended the flash illumination angle of coverage to be compatible with lens of
24mm to 200mm focal length. When the built-in Wide Panel is utilized, the flash covers an angle of up
to that of a 17mm lens.
Catch Light Panel
This flash is equipped with a built-in catch light panel, which can highlight the eyes of the subject
when the bounce flash mode is activated.
Slave Flash Function
Slave Flash allows the flash to be fired away from the camera by the master unit. The Designated Slave
function allows the photographer to use two or more EF-630 flash units simultaneously. It is possible
to designate flashguns by using different channel settings. Since the EF-630 is equipped with this
function, it can be used with all camera models. In the Normal Slave mode, it is also possible to use the
camera's built-in flash or another flash unit as the Master (Flash Exposure must be adjusted
manually).
FP Flash function for high shutter speeds.
Flash synchronization speed is usually limited to coincide with the full shutter opening of focal plane
shutters, limiting the use of high shutter speeds with flash. The FP flash function makes flash
photography possible at shutter speeds greater than the normal synchronization speed. When the lens
diaphragm is set to larger apertures to limit depth of field in synchronized daytime shooting, high
shutter speeds can be used to balance the daylight and the flashlight at any shutter speed.
*This function is not available with some camera models.
AF assist light for accurate auto-focus in low light conditions.
AF may not function smoothly in dark conditions. However, the AF assist light of the EF-630 allows
control of AF even in situations where autofocusing is difficult.