Yongnuo YN-500Ex YN500Ex High-speed sync HSS Flash Speedlite/Speedlight 1/8000 For canon The YN500EX can be triggered by the camera set-top, built-in or main-controlled flashing command, S1 and S2 (pre-flash-canceled mode). YN500EX is the first speedlite supports high-speed flash in china; with high-speed sync (FP flash), the YN500EX can synchronize with all shutter speeds, the maximum shutter sync up to 1/8000. GN53@ ISO100, 105mm; which reaches the level of the mainstream hot shoe flashes, supports HSS, TTL/M/Multi mode. One YN500EX is able to respectively accept internal flashing of 580EX II, SB-900/800/700, 7D/60D/600D, C order of N?s internal flashing and ST-E2 wireless signal, achieves external TTL and manual flashing. Some beckoning functions such as wireless TTL flashing, grouping light ratio TTL flashing and the illumination of remote controlled flashing can be easily attained only if you carry a camera with built-in flashing command system and YN500EX. The covered focal length will vary among auto, 24-105mm on the lamp adapter by operating the zoom button on the flash light, supports full-frame/half-frame camera.