Canon EOS 5D Mark II Instruction Manual - Page 17

Housing Conversion Circuitry This housing has Conversion Circuitry built into the camera tray, page 7. When used with Ikelite DS Substrobes, the Conversion Circuitry provides real Canon eTTL flash exposure with over and underexposure compensation of two f-stops in half-stop increments. The Conversion Circuitry also offers 8 manual power settings in 1/2 stop increments and is powered by the Ikelite DS Substrobe when connected to the housing with the #4103.51 single or #4103.52 dual sync cord. Using the Conversion Circuitry (Set DS Substrobe to TTL mode) - Mode and Compensation Buttons The Conversion Circuitry default is set to TTL. To switch between TTL and Manual Modes, depress both Mode Buttons at the same time and keep them depressed until you see the desired Yellow LED Mode illuminate. - TTL Mode (indicated when the yellow LED directly below TTL is illuminated). TTL Mode is the default setting. When the DS Substrobe is powered ON, the yellow TTL LED will illuminate. None of the Red LEDs will illuminate. This indicates that no (+) plus or (-) minus compensation is selected. Depress the Mode buttons to select +/- compensation. Note that the TTL +/- compensation values are in the yellow bar with the heading TTL. - Manual Mode (indicated when the yellow LED directly below the M is illuminated). When the Manual Mode is selected, the Red LED directly below the F (full power) will illuminate. Note that the Manual minus (-) compensation values are in the black bar with the heading M. Set DS Substrobe to TTL mode. This will allow the strobe power to be varied in manual mode. 17