A high-efficiency circuit design keeps the stability of the lighting outputs. The controller can be installed on most of the DSLR camera models. With adapter ring, it is applicable to macro lens of many diameter. It has flash mode and light mode, 7 levels brightness adjustment, max flash sync speed is 1/250s*.The left / right flash head can be turned on respectively to get special lighting effects. When full turn on flash there is no shadow in macro-photography shooting. So it is applicable to take photos of still life, flowers and insects at close range as well as photography of special field, such as: dentistry use. It can also use the light mode to take videos at close range. The sync speed with some cameras or flashes maybe lower. This macro ring flash is specially designed for macro lens, non-macro lens may be rotated when focusing, so it suggests using manual focusing (MF) when non-macro lens is used. Half pressing the shutter button of the camera (camera metering on). The LED lamp will keep on in low power, it assists focusing in low light. A few seconds (camera metering off) off. (Flash mode only) Three LED lamps can lighting only the left side only, right side only or full side. It is very convenient for the users to use. There are two hot-shoe recesses on the macro ring flash and the controller. Suitable for: Any cameras with standard hot-shoe Other non-standard hot-shoe camera needs a hot-shoe adapter (not included) 58mm Macro Lens Package includes: 1× Yongnuo MR-58 LED Macro Ring Light 2× AA Batteries 1× Adapter Ring 1× Manual 1× Original Packing