When used with FreeXwire, the Qflash 5d-R now supports wireless control of all dedicated camera-flash functions - including Manual, TTL, Auto, Auto-fill and TTL-Ratio - up to 500 feet away. Qflash 5d-R blends seamlessly with Canon, Nikon and other professional digital camera systems, using Quantum's proprietary QTTL adapters. In some cases, it even provides capabilities a camera system may not support - such as wireless remote Fill-Flash. Combined Qflash 5d-R/FreeXwire systems open up new wireless lighting opportunities. Even the most complex set-ups can be accomplished quickly, easily and reliably. Features:Studio Quality, Parabolic reflectorModel T5d-R - 150 watt-seconds flash power (vs. 50w-s for shoe mount flash)Full digital and film camera dedicationWireless TTL with multiple TTL-ratio using FreeXwireWireless Auto-fill using FreeXwireLink to Canon/Nikon wireless TTL flash system with QnexusSensor Limit for Auto and Auto-Fill modesOver/under exposure displayed after a shot in 1/3-stops.25 precision 1/3-stop Auto settings19 precision 1/3-stop Manual settingsModel T5d-R - powered by Quantum Turbo SC, Turbo, Turbo 2x2 or Turbo Compact