Features and Functions: Description: 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 Guide # (ISO 100) 59 feet Manual No Automatic Yes Auto Apertures FS.6(ISO 100) Auto Range 1-10 feet Multi-Dedicated No TTL Program Yes Infrared Focus Assist No Auto Illuminator Range N/A Angle of Coverage 80? Auto Confirmation Light Yes Bounce Angle No Zoom No Swivel No Recycling Time 0.5 - 6 sec. Number of Flashes 120 - 2,000 Flash Duration(sec.) 1/1,000 - 1/40,000 Color Temperature 5600? k Power Source 4AA Batteries Dimensions H 7.0? x W 3.4? x D 2.0? Weight (w/o batteries) 9.7 oz. Accepts PC Cord No Twin Flash No