Yongnuo Professional Flash Speedlight Flashlight YN 565EX for Nikon D3 D3X D3S D2X D700 D300 D300S The YN565EX can be triggered by hot-shoe, flash command slave mode, optical S1, and S2(pre-flash-canceled mode). The YN565EX covers a focal length range of auto, and 24 to 105mm, supports full-frame/half-frame camera. It only takes 3 seconds to finish a charging cycle after a full level output, you can use external power pack to accelerate the charging speed once more. Press down the cameras depth-of-fired preview button, the YN565EX will send out continuous flash lasting one second. To the right for 90 degree to the left for 180 degree, and front to 7 degree, back to 90 degree. So the wireless sensor can face to the master unit.