I'm thinking of getting a SB-700 to do some off camera shoots but I'm not sure if it will sync with my D3100. I've heard of CLS on the web after a few days of research but I also realised the on-camera flash on my D3100 does not support being a Commander or Master. What does that mean? Can I still take my SB-700 off camera, synced to the camera and act as a remote/slave flash even with my camera not having this Commander option?
Also must the on-camera flash fire for the off-camera flash to fire? I've heard of IR and radio sync systems but if I'm not wrong Nikon's CLS is just purely light detection. Meaning I need to have 1 flash firing to set the other flashes off first?
Well if I need not a Master flash and a slave flash to get both of them to fire at the same time(ie if the answer to my first question above is Yes), can I just use my on-camera flash(which is not Commander enabled) and get a purely slaved SB-600(cheaper) to do the off-camera flash work?
Sorry for the lump of questions and if the phrasing is messy. Also didn't really thoroughly check the forum if someone asked this before so sorry for the repeat(didn't find any flash/strobe guide in this forum too...).