Innovation off: the device firing 360 - Universal LED Macro Ring Flash 18 Grand 4 ring broadcasters colors + 8x conversion (49mm, 52mm 55mm, 58mm, 62mm, 67mm, 72mm, 77mm) for Canon, Nikon, Olympus Pentax (continuous light and flash support) (Electronics)
Used yesterday for the first time in proxy, I am very satisfied with the equipment. Easy to use, lightweight (plastic) and cheap, for occasional use. When mounted on a Pentax 100mm macro lens, 49mm diameter. I recommend this ring flash.