Ok, another series of noob questions from a uber noob!
1. How can Nikon camera trigger flash wirelessly without using an external transmitter, and how does it work (IR/optical)? Versus Canon DSLRs which require ET52?
2. Does activating a flash optically make it susceptible to inadvertent flash activation via other photog's flash close by (or is there some sort of signal / channel thingy involved that prevents this?)
3. How does Nissin flashes compare with the 430EXII, besides guide number? The 430 activates via IR but Nissin thru optical - does that mean I can forgo the ET52 and PW for Nissin flashes?
Thanks in advance!