[wavemachine]

Question 1

I currently have a single 580 ex2 canon speedlite I can control this off camera via flash triggers I bought off ebay or using the &D's remote flash system. I am looking to get a second external flash but cannto justify the cost of another 580 EXII and have read good things about the Nissin DI866 does anyone know if this can be controlled as a slave from the 7D?

Question 2

I also have an Interfit EXD200 studio kit which I am really pleased with however I want to experiment with some low key photography so need 2 flashes to illuminate the white background and two to illuminate the subject, currently I control the Interfit via a Kenro IR trigger that sits on the hotshoe.

I was wondering if I could use two speedlights to illuminate the background and the studio lights to illuminate the subject, well I know I can but how can I control this from the camera? My only thought was to control the stuido lights via the sync cable and usewireless triggers to control the sppedlights or the built in speedlight controller. I guess what I am asking is can the sync socket be used in conjuction with the hotshe?

Many thanks.