MINOLTA 280PX Auto ElectroFlash Maximum Guide Number at ISO 100 - 92 feet Special circuitry minimizes battery drain when charged, and power level is adjustable to Hi or Lo settings Autoflash Control - by Direct Autoflash Metering (TTL off-the-film) system with the Minolta X-700 Auto Distance Range - 2.3 - 23 Auto F/Stops - F/2.8 - F/16