[. . . ] These features apply in combination with Dw series QTTL Adapters and FreeXWire Receivers FW7Q and FW8R, Transmitter FW9T, and Transceiver FW10w. [. . . ] The Sections below are addendums to the Qflash 4d Operating Instructions, included with your Qflash 5d. For additional set-up details please refer also to the operating instructions for Dw QTTL Adapters and FreeXWires FW7Q, FW8R, and FW9T. Section 6. 6 Wireless Pre-flash TTL TTL control of Qflash 5d is possible when shooting with digital or film cameras that use "pre-flash" evaluative metering. By combining a Qflash 5d with a Dw series QTTL adapters and FreeXWire digital radios, wireless TTL exposure control is possible. A remote Qflash will send a signal back to the control confirming that it received the data, if the remote Qflash is connected to an FW10/10w. If a remote flash is connected to an FW7Q receiver or an FW8R receiver, it will not send back a confirming signal. To avoid confusion when using an FW7Q or FW8R Receiver, set the Control Qflash to not expect a confirmation signal back from the remotes. Changing data confirmation signal Press the Option button three times. [. . . ] Use the Up R1 R1 R2 R2 or Down buttons to set the following conditions. Remote flash 1 connected to an FW7Q or FW8R receiver -- no confirmation signal expected Remote flash 1 connected to an FW10 receiver -- expect a confirmation signal. [. . . ]