Buy on Amazon : br br Quantum Q Flash X5DR Digital br br Full TTL Dedication for new digital and film cameras br Automatic Fill Mode This mode allows setting fill flash ratios when used with one of the new QTTL adapters Fill-flash ratios can be controlled even for cameras that do not have fill-flash capabilities br Automatic Sensor Limit This option limits the distance the Qflash sensor sees when in Auto mode This prevents subject blow out A Qflash 4 with QTTL adapters lets you use Sensor Limit in Program Auto and Autofill modes while the flash exposure tracks the camera fnumber settings br Quick Turn off For temporary turning off the flash br Twice as many Program Modes