Conversion circuitry in the housing allows the latest Ikelite DS SubStrobes to provide real iTTL flash control as dictated by the Nikon camera, providing standard iTTL for matrix, center-weighted and spot metering. All of these settings work well. The circuitry is powered by the SubStrobe which must be attached with a single #4103.51 or #4103.52 dual sync cord. These cords are identifiable by their blue band.

DS-50 and DS-125 SubStrobes produced before September, 2004 communicate with the camera as per old Nikonos protocol. These audible ready and confidence signals interfere with required communication for the new eTTL and iTTL digital cameras. The newest cameras also require the latest IGBT strobe circuits to perform the required rapid turning on and off. See serial numbers listed below.

* Updated strobes still operate fine with all installations including Nikonos.

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

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