Conversion circuitry in the housings allows the latest Ikelite DS model SubStrobes to provide real eTTL and eTTL2 flash control as dictated by the camera. The circuitry is powered by the SubStrobe and MUST be connected with our newest 5-conductor #4103.51 single or #4103.52 dual sync cord which can be identified by their blue band.

The circuitry powers up automatically when the strobe is turned on, lighting the yellow LED under "TTL" on the label indicating the system is ready to use.

The arrow buttons under "Mode" on the label provide up to two f/stops over or under flash exposure compensation in half/stop increments. Minus one f/stop is shown in this photograph.

Push both buttons simultaneously for one second to change from eTTL to Manual strobe control. The yellow LED under "M" on the label illuminates, and the red LED shows "F" indicating full power. The arrow buttons access the eight manual power settings in half/stop increments.

All current DS model SubStrobe circuitry has been updated to provide optimum performance with all current systems. DS-50 and DS-125 SubStrobes produced before September, 2004 send audible ready and confidence signals to the camera for four seconds after taking a photo as per old Nikonos protocol. This interferes with required communication for new eTTL digital cameras. Removal of this signaling allows these strobes to operate correctly with current digital protocal. See serial numbers below.* DS-50 SubStrobes can NOT be converted to DS-51 specifications

DS-50 SubStrobes with Serial Number below 63,850 can NOT be updated to operate correctly with the latest eTTL conversion circuitry. DS-50 SubStrobes with Serial Number between 63,850 and 69,999 require a $100 update to operate with the latest eTTL conversion circuitry. *

DS-125 SubStrobes with Serial Number below 2,500 can NOT be updated to operate with the latest eTTL conversion circuitry. DS-125 SubStrobes with Serial Number between 2,500 and 4.999 require a $100 update to operate with the latest eTTL conversion circuitry. *