With unbelievable power for the price, the RL-59 series of ringlight flashes from Phoenix delivers. Made for each specific autofocus camera, they give full TTL metering to allow accurate exposures of closeup subjects. When shooting at extremely short distances, relatively minor movement of lighting and subject results in relatively large changes of exposure. Shooting quick-moving subjects in rapidly changing conditions becomes an exercise in dependency on film latitude. TTL metering eliminates the need for lengthy calculations of exposure, because the inherent loss of light at macro distances can automatically be accounted with ease.
Note:
Not compatible with digital cameras.