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Any chance I can use the SB-400 in conjunction with my SB-600s? I know it won;t do wireless but maybe an SU-4 unit or SC-28/29 cable?
None of your options are good.Mostly you will need to have everything in manual.Su-4 is probably the easiest although there are third party stuff that will work.The SB 600 will not work with the camera flash in manual -- only CLS.The slaves that will fit on the SB 400 mostly will not work if the other units are in CLS mode (some exceptions but how reliable they are is a question) My opinion -- get another SB 600.The D40 does not do CLS so it will not fire the SB 600 remotely anyway.There are some inexpensive radios on e-bay -- they may be your best solution (no personal experience with them) Quantums and other quality radios are not cheap at $200 plus each.