I picked up a used SB-29 from keh to work with My D3 and D2H and now F4s.
On the D2H and D3 I must using manual (full power,1/4)and on the F4 I get TTL. Because Im able to chimp(D2H, D3) using the "unit on manual is no problem. Im really happy with the ring light, combined with my newly aquired 105 F4 AIS and the 200 F 4 IF AIS TC's and tubes a whole new world has opened up for me. It's amazing how much power this little unit packs. When Im using the 200 plus TC's and tubes I need all the power I can get. Going with the SB-29 is a cheap/good if not aways fast way to go. Hope this helps