I would like to use a SB 27 as a remote flash with my d70s. Problem is that the more I read, the more confused I get. Will the d70s fire the sb 27 on its own? If not, do I need something like the SU-4? Are su-4's even available? Are there modern equivalents? I am looking for easy and cheap way to connect these pieces of gear in order to try my hand at shooting with flash. Any comments that help to lift the fog will be greatly appreciated.