The Sigma EF610 is a shoe mount camera flash, perfect for serious and dedicated photography. The auto zoom feature of this Sigma shoe mount flash enables it to adjust to the optimal illumination angle, depending on the focal length of the lens in use. With a tilt ability of 90 degrees up, 180 degrees left, 180 degrees right, and 7 degrees down, this Sigma camera flash offers greater flexibility to the user. Other advanced and crucial features of this Sigma shoe mount flash are modeling flash, multi-pulse flash, TTL wireless flash, FP (high speed) flash, rear-curtain Synchro flash, and manual flash modes. For better energy efficiency and power saving, this Sigma camera flash is engineered with an auto power-off function that shuts off the LCD panel when not in use. The Sigma EF610 is meant to be used with Canon AF DSLR camera models.