I've added a slave flash to my macro setup, but very often the slave flash won't fire, because it's not getting enough light from the main flash (line-of-sight obstructed, not much reflection from the subject, etc.). I could go to a radio flash trigger, but it seems like an unnecessary expense and complication, given that I don't need my flashes to more than about two feet apart. It occurred to me that I could do just fine with a "wired" connection, but I'm not sure if it works the way I think it would. Any help would be appreciated. Is it really as simple as using a TTL-capable hot-shoe adapter on the main flash that also has a PC-cable port? Then I guess I'd put a generic PC/hot-shoe adapter under the slave flash, and connect the two PC ports. Is that all there is to it?