I have just done a couple of above water tests with my D3x, the Ikelite D2x TTL adapter with dual DS-125s, and my Subal ND3 housing. It appears that the Ikelite TTL adapter works works well using both A and Manual camera modes. The housing fits the D3x perfectly as you would expect. 
Lights, Strobes, and Lighting Technique / Archived topic
D3x Subal ND3 Ikelite D2x TTL adapter DS-125s, it works
Started by dysert ·
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D3x Subal ND3 Ikelite D2x TTL adapter DS-125s, it works
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Thanks for posting about the compatibility of the Ikelite iTTL D2x adapter and the Nikon D3x, as this was the biggest unanswered question that I had about the Nikon D3 and D3x. The electronic flash algorithms for the D2x and the D3/x seem to be slightly different according to HeinrichsWeikamp website. The D2x having a timing 1/20000 and one preflash whereas the D3/x has two preflashes and a timing of 1/8000.
While this information is great to know for me it's still kind of academic as I intend to wait for the next iteration of top level Nikon FX format camera to upgrade. I find my Nikon D2x still leaves me with a huge amount of camera to experiment and work with as of yet.
