Yongnuo flash YN568ex ii Wireless Flash TTL Flash Speedlite for CANON Camera flash canon 50d + Two Free OOPSTEK Cleaning cloth for camera lenses canon lenses Supports high-speed sync flash with high-speed sync (FP flash), the YN568EX II can synchronize with all shutter speeds. The maximum shutter synchronous speed is up to 1/8000 Wireless TTL Slave for Canon and Nikon and Hot shoe TTL for Canon High guide number, TTL and High speed sync: GN58@ ISO100, 105mm; which reaches the level of the mainstream hot shoe flashes, supports HSS, TTL/M/Multi mode. Multiple trigger mode supported: The YN568EX II can be triggered by the camera set-top, built-in or main-controlled flashing command, S1 and S2 (pre-flash-canceled mode). Compatible with N's and C's wireless flashing system: One YN568EX II is able to respectively accept internal flashing of YN568EX II, 580EX II, SB-910/900/800/700, 7D/60D/600D, C commander of N's built-in flashing and ST-E2 wireless signal, achieves off camera TTL and manual flashing.