Until the recent introduction of the Ray Flash Ringflash Adapter, most photographers could only dream of working with a ring flash because they are expensive and big and need to be plugged into a power source.
The ringflash originally invented in 1952 for use in dental photography is a circular photographic flash that fits around the lens. Having illumination on the same axis as the lens is particularly useful, especially for use in macro (or close-up) photography as the light surrounding the lens gives very even illumination with few shadows. Moreover, at close working distances, off-axis lighting can present problems as the lens itself can cast a shadow on the subject.
