Discover how soft and shadow-free your close-up photos can be with the SRF-11 Ring Flash Set from Olympus which consists of the RF-11 ring flash and FC-1 macro flash controller. The device utilizes a circular tube as its light source for just the right amount of illumination. The flash has a guide number of 36' at ISO 100 and is ideal for medical and macro photography. The set includes a carrying case that will hold both the SRF-11 and the FC-1. This ring flash works with the Olympus 35mm and 50mm Digital Zuiko Macro lenses and requires the Olympus FR-1 Flash Adapter Ring for E-series cameras. It will also work with the 60mm Macro lens with the use of the optional FR-2 adapter. Additionally, it runs on either 4 AA batteries or 2 Olympus LB-01 (CR-V3 type) lithium batteries.