Viltrox JY610 II Mini Universal Speedlite for Nikon Sony Canon Pentax Olympus etc. DSLR Cameras 1. JY610 II is a mini speedlight flash unit which is light weight on any camera. 2.Flash head adjustable 0-90 degrees,easier and more convenient to use 3.Guide number:GN 27 (in focal length 50mm at ISO 100 in meters) 4.Exposure control: manual operation, fixed flash light output, non-adjustable 5.Quick safety lock is provided and can be mounted on any standard hot shoe