The Nissin Di600 Flash is a shoe-mounted flash unit designed for Canon cameras with E-TTL / E-TTL II functionality. It features a guide number of 145? at ISO 100 in the 105mm position for providing excellent coverage within a zoom range of 24 to 105mm, or down to 16mm with the built-in wide-angle diffuser. The Di600 supports wireless slave functionality and can still utilize TTL metering. It can be controlled by using a master flash unit in channel 1 and group a. This allows you to be more creative with your lighting design. Additionally, manual control is possible with 6 different levels, from full 1/1 down to 1/32 power in full-stop increments. For utilizing techniques like bounce flash, the Di600 can tilt upward 90? and it features 270? rotation. This allows for simple adjustments for a big improvement in the quality of light you desire. It also has a built-in reflection panel for adding some fill light to your shots. The flash operates on four AA batteries and includes a stand for off-camera operation. Allows for -1.5 to +1.5 EV compensation in half-stop increments A ?My TTL? setting allows for adjustment of the TTL exposure level from -0.75 to +0.75 in 0.25-step increments. Compatible with in-camera exposure lock. Flash can also be synchronized to pre-flash and traditional wireless systems Rear curtain synchronization and red eye reduction is possible when used in conjunction with capable cameras An AF-assist light will provide accurate focusing in low light. Energy saving system places the unit in sleep mode after 5 minutes without use and will automatically power off the unit after 60 minutes. This system is cancelled while in slave mode. The Di600 features a recycle time of approximately 5 seconds PC and 3.5mm sync ports available for compatibility with various lighting equipment